~maria-captains/maria/5.5-hf-tokudb

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
COPYING CONDITIONS NOTICE:

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below).

      * Redistributions in binary form must reproduce this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below) in the documentation and/or other materials
        provided with the distribution.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.

COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

UNIVERSITY PATENT NOTICE:

  The technology is licensed by the Massachusetts Institute of
  Technology, Rutgers State University of New Jersey, and the Research
  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
  and/or patent applications resulting from it.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.

PATENT RIGHTS GRANT:

  "THIS IMPLEMENTATION" means the copyrightable works distributed by
  Tokutek as part of the Fractal Tree project.

  "PATENT CLAIMS" means the claims of patents that are owned or
  licensable by Tokutek, both currently or in the future; and that in
  the absence of this license would be infringed by THIS
  IMPLEMENTATION or by using or running THIS IMPLEMENTATION.

  "PATENT CHALLENGE" shall mean a challenge to the validity,
  patentability, enforceability and/or non-infringement of any of the
  PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.

  Tokutek hereby grants to you, for the term and geographical scope of
  the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
  irrevocable (except as stated in this section) patent license to
  make, have made, use, offer to sell, sell, import, transfer, and
  otherwise run, modify, and propagate the contents of THIS
  IMPLEMENTATION, where such license applies only to the PATENT
  CLAIMS.  This grant does not include claims that would be infringed
  only as a consequence of further modifications of THIS
  IMPLEMENTATION.  If you or your agent or licensee institute or order
  or agree to the institution of patent litigation against any entity
  (including a cross-claim or counterclaim in a lawsuit) alleging that
  THIS IMPLEMENTATION constitutes direct or contributory patent
  infringement, or inducement of patent infringement, then any rights
  granted to you under this License shall terminate as of the date
  such litigation is filed.  If you or your agent or exclusive
  licensee institute or order or agree to the institution of a PATENT
  CHALLENGE, then Tokutek may terminate any rights granted to you
  under this License.
*/

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
/* -*- mode: C; c-basic-offset: 4 -*- */
#define MYSQL_SERVER 1
#include "hatoku_defines.h"
#include <db.h>

#include "stdint.h"
#if defined(_WIN32)
#include "misc.h"
#endif
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include "toku_os.h"
#include "toku_time.h"
#include "partitioned_counter.h"

/* We define DTRACE after mysql_priv.h in case it disabled dtrace in the main server */
#ifdef HAVE_DTRACE
#define _DTRACE_VERSION 1
#else
#endif

#include <mysql/plugin.h>
#include "hatoku_hton.h"
#include "ha_tokudb.h"

#undef PACKAGE
#undef VERSION
#undef HAVE_DTRACE
#undef _DTRACE_VERSION

#define TOKU_METADB_NAME "tokudb_meta"

typedef struct savepoint_info {
    DB_TXN* txn;
    tokudb_trx_data* trx;
    bool in_sub_stmt;
} *SP_INFO, SP_INFO_T;

static uchar *tokudb_get_key(TOKUDB_SHARE * share, size_t * length, my_bool not_used __attribute__ ((unused))) {
    *length = share->table_name_length;
    return (uchar *) share->table_name;
}

static handler *tokudb_create_handler(handlerton * hton, TABLE_SHARE * table, MEM_ROOT * mem_root);

static MYSQL_THDVAR_BOOL(commit_sync, 
    PLUGIN_VAR_THDLOCAL, 
    "sync on txn commit",
    /* check */ NULL, 
    /* update */ NULL,
    /* default*/ true
);
static MYSQL_THDVAR_UINT(pk_insert_mode,
    0,
    "set the primary key insert mode",
    NULL, 
    NULL, 
    1, // default
    0, // min?
    2, // max
    1 // blocksize
);
static MYSQL_THDVAR_BOOL(load_save_space,
    0,
    "if on, intial loads are slower but take less space",
    NULL, 
    NULL, 
    false
);
static MYSQL_THDVAR_BOOL(disable_slow_alter,
    0,
    "if on, alter tables that require copy are disabled",
    NULL, 
    NULL, 
    false
);
static MYSQL_THDVAR_BOOL(disable_hot_alter,
    0,
    "if on, hot alter table is disabled",
    NULL, 
    NULL, 
    false
);
static MYSQL_THDVAR_BOOL(create_index_online,
    0,
    "if on, create index done online",
    NULL, 
    NULL, 
    true
);
static MYSQL_THDVAR_BOOL(disable_prefetching,
    0,
    "if on, prefetching disabled",
    NULL, 
    NULL, 
   false
);
static MYSQL_THDVAR_BOOL(prelock_empty,
    0,
    "Tokudb Prelock Empty Table",
    NULL, 
    NULL, 
    true
);
static MYSQL_THDVAR_BOOL(log_client_errors,
    0,
    "Tokudb Log Client Errors",
    NULL, 
    NULL, 
    false
);
static MYSQL_THDVAR_UINT(block_size,
    0,
    "fractal tree block size",
    NULL, 
    NULL, 
    4<<20, // default
    4096,  // min
    ~0U,   // max
    1      // blocksize???
);
static MYSQL_THDVAR_UINT(read_block_size,
    0,
    "fractal tree read block size",
    NULL, 
    NULL, 
    128*1024, // default
    4096,  // min
    ~0U,   // max
    1      // blocksize???
);
static MYSQL_THDVAR_UINT(read_buf_size,
    0,
    "fractal tree read block size", //TODO: Is this a typo?
    NULL, 
    NULL, 
    128*1024, // default
    0,  // min
    1*1024*1024,   // max
    1      // blocksize???
);
#if TOKU_INCLUDE_UPSERT
static MYSQL_THDVAR_BOOL(disable_slow_update, 
    PLUGIN_VAR_THDLOCAL, 
    "disable slow update",
    NULL, // check
    NULL, // update
    false // default
);
static MYSQL_THDVAR_BOOL(disable_slow_upsert, 
    PLUGIN_VAR_THDLOCAL, 
    "disable slow upsert",
    NULL, // check
    NULL, // update
    false // default
);
#endif
static MYSQL_THDVAR_UINT(analyze_time,
    0,
    "analyze time",
    NULL, 
    NULL, 
    60, // default
    0,  // min
    ~0U,   // max
    1      // blocksize???
);

static void tokudb_checkpoint_lock(THD * thd);
static void tokudb_checkpoint_unlock(THD * thd);

static void tokudb_checkpoint_lock_update(
    THD* thd,
    struct st_mysql_sys_var* var,
    void* var_ptr,
    const void* save) 
{
    my_bool* val = (my_bool *) var_ptr;
    *val= *(my_bool *) save ? true : false;
    if (*val) {
        tokudb_checkpoint_lock(thd);
    }
    else {
        tokudb_checkpoint_unlock(thd);
    }
}
  
static MYSQL_THDVAR_BOOL(checkpoint_lock,
    0,
    "Tokudb Checkpoint Lock",
    NULL, 
    tokudb_checkpoint_lock_update, 
    false
);

static const char *tokudb_row_format_names[] = {
    "tokudb_uncompressed",
    "tokudb_zlib",
    "tokudb_quicklz",
    "tokudb_lzma",
    "tokudb_fast",
    "tokudb_small",
    "tokudb_default",
    NullS
};

static TYPELIB tokudb_row_format_typelib = {
    array_elements(tokudb_row_format_names) - 1,
    "tokudb_row_format_typelib",
    tokudb_row_format_names,
    NULL
};

static MYSQL_THDVAR_ENUM(row_format, PLUGIN_VAR_OPCMDARG,
                         "Specifies the compression method for a table during this session. "
                         "Possible values are TOKUDB_UNCOMPRESSED, TOKUDB_ZLIB, TOKUDB_QUICKLZ, "
                         "TOKUDB_LZMA, TOKUDB_FAST, TOKUDB_SMALL and TOKUDB_DEFAULT",
                         NULL, NULL, SRV_ROW_FORMAT_DEFAULT, &tokudb_row_format_typelib);

srv_row_format_t get_row_format(THD *thd)
{
    return (srv_row_format_t) THDVAR(thd, row_format);
}

static void tokudb_print_error(const DB_ENV * db_env, const char *db_errpfx, const char *buffer);
static void tokudb_cleanup_log_files(void);
static int tokudb_end(handlerton * hton, ha_panic_function type);
static bool tokudb_flush_logs(handlerton * hton);
static bool tokudb_show_status(handlerton * hton, THD * thd, stat_print_fn * print, enum ha_stat_type);
static int tokudb_close_connection(handlerton * hton, THD * thd);
static int tokudb_commit(handlerton * hton, THD * thd, bool all);
static int tokudb_rollback(handlerton * hton, THD * thd, bool all);
#if TOKU_INCLUDE_XA
static int tokudb_xa_prepare(handlerton* hton, THD* thd, bool all);
static int tokudb_xa_recover(handlerton* hton, XID*  xid_list, uint  len);
static int tokudb_commit_by_xid(handlerton* hton, XID* xid);
static int tokudb_rollback_by_xid(handlerton* hton, XID*  xid);
#endif

static int tokudb_rollback_to_savepoint(handlerton * hton, THD * thd, void *savepoint);
static int tokudb_savepoint(handlerton * hton, THD * thd, void *savepoint);
static int tokudb_release_savepoint(handlerton * hton, THD * thd, void *savepoint);
static int tokudb_discover(handlerton *hton, THD* thd, const char *db, const char *name, uchar **frmblob, size_t *frmlen);
static int tokudb_discover2(handlerton *hton, THD* thd, const char *db, const char *name, bool translate_name,uchar **frmblob, size_t *frmlen);
handlerton *tokudb_hton;

const char *ha_tokudb_ext = ".tokudb";
char *tokudb_data_dir;
ulong tokudb_debug;
DB_ENV *db_env;
DB* metadata_db;
HASH tokudb_open_tables;
pthread_mutex_t tokudb_mutex;
pthread_mutex_t tokudb_meta_mutex;

static PARTITIONED_COUNTER tokudb_primary_key_bytes_inserted;
void toku_hton_update_primary_key_bytes_inserted(uint64_t row_size) {
    increment_partitioned_counter(tokudb_primary_key_bytes_inserted, row_size);
}

static ulonglong tokudb_lock_timeout;
static ulong tokudb_cleaner_period;
static ulong tokudb_cleaner_iterations;

#define ASSERT_MSGLEN 1024

void toku_hton_assert_fail(const char* expr_as_string, const char * fun, const char * file, int line, int caller_errno) {
    char msg[ASSERT_MSGLEN];
    if (db_env) {
        snprintf(msg, ASSERT_MSGLEN, "Handlerton: %s ", expr_as_string);
        db_env->crash(db_env, msg, fun, file, line,caller_errno);
    }
    else {
        snprintf(msg, ASSERT_MSGLEN, "Handlerton assertion failed, no env, %s, %d, %s, %s (errno=%d)\n", file, line, fun, expr_as_string, caller_errno);
        perror(msg);
        fflush(stderr);
    }
    abort();
}

//my_bool tokudb_shared_data = false;
static uint32_t tokudb_init_flags = 
    DB_CREATE | DB_THREAD | DB_PRIVATE | 
    DB_INIT_LOCK | 
    DB_INIT_MPOOL |
    DB_INIT_TXN | 
    DB_INIT_LOG |
    DB_RECOVER;
static uint32_t tokudb_env_flags = 0;
// static uint32_t tokudb_lock_type = DB_LOCK_DEFAULT;
// static ulong tokudb_log_buffer_size = 0;
// static ulong tokudb_log_file_size = 0;
static my_bool tokudb_directio = FALSE;
static my_bool tokudb_checkpoint_on_flush_logs = FALSE;
static ulonglong tokudb_cache_size = 0;
static ulonglong tokudb_max_lock_memory = 0;
static char *tokudb_home;
static char *tokudb_tmp_dir;
static char *tokudb_log_dir;
// static long tokudb_lock_scan_time = 0;
// static ulong tokudb_region_size = 0;
// static ulong tokudb_cache_parts = 1;
const char *tokudb_hton_name = "TokuDB";
static uint32_t tokudb_checkpointing_period;
static uint32_t tokudb_fsync_log_period;
uint32_t tokudb_write_status_frequency;
uint32_t tokudb_read_status_frequency;
#ifdef TOKUDB_VERSION
char *tokudb_version = (char*) TOKUDB_VERSION;
#else
char *tokudb_version;
#endif
static int tokudb_fs_reserve_percent;  // file system reserve as a percentage of total disk space

#if defined(_WIN32)
extern "C" {
#include "ydb.h"
}
#endif

ha_create_table_option tokudb_table_options[]=
{
  HA_TOPTION_ENUM("compression", row_format,
                  "TOKUDB_UNCOMPRESSED,TOKUDB_ZLIB,TOKUDB_QUICKLZ,"
                  "TOKUDB_LZMA,TOKUDB_FAST,TOKUDB_SMALL", 0),
  HA_TOPTION_END
};

ha_create_table_option tokudb_index_options[]=
{
  HA_IOPTION_BOOL("clustering", clustering, 0),
  HA_IOPTION_END
};

// A flag set if the handlerton is in an initialized, usable state,
// plus a reader-write lock to protect it without serializing reads.
// Since we don't have static initializers for the opaque rwlock type,
// use constructor and destructor functions to create and destroy
// the lock before and after main(), respectively.
static int tokudb_hton_initialized;
static rw_lock_t tokudb_hton_initialized_lock;

static void create_tokudb_hton_intialized_lock(void)  __attribute__((constructor));
static void destroy_tokudb_hton_initialized_lock(void) __attribute__((destructor));

static void create_tokudb_hton_intialized_lock(void)
{
    my_rwlock_init(&tokudb_hton_initialized_lock, 0);
}

static void destroy_tokudb_hton_initialized_lock(void)
{
    rwlock_destroy(&tokudb_hton_initialized_lock);
}

static SHOW_VAR *toku_global_status_variables = NULL;
static uint64_t toku_global_status_max_rows;
static TOKU_ENGINE_STATUS_ROW_S* toku_global_status_rows = NULL;

static int tokudb_init_func(void *p) {
    TOKUDB_DBUG_ENTER("tokudb_init_func");
    int r;
#if defined(_WIN64)
        r = toku_ydb_init();
        if (r) {
            printf("got error %d\n", r);
            goto error;
        }
#endif

    // 3938: lock the handlerton's initialized status flag for writing
    r = rw_wrlock(&tokudb_hton_initialized_lock);
    assert(r == 0);

    db_env = NULL;
    metadata_db = NULL;

    tokudb_hton = (handlerton *) p;

    pthread_mutex_init(&tokudb_mutex, MY_MUTEX_INIT_FAST);
    pthread_mutex_init(&tokudb_meta_mutex, MY_MUTEX_INIT_FAST);
    (void) my_hash_init(&tokudb_open_tables, table_alias_charset, 32, 0, 0, (my_hash_get_key) tokudb_get_key, 0, 0);

    tokudb_hton->state = SHOW_OPTION_YES;
    // tokudb_hton->flags= HTON_CAN_RECREATE;  // QQQ this came from skeleton
    tokudb_hton->flags = HTON_CLOSE_CURSORS_AT_COMMIT | HTON_EXTENDED_KEYS;

#if TOKU_INCLUDE_OTHER_DB_TYPE
    // we have historically been a dynamic storage engine, so we set db_type according.
    // however, extended keys is triggered off of the db_type, so tokudb adds another type so that extended keys works
    tokudb_hton->db_type = DB_TYPE_UNKNOWN;
    tokudb_hton->other_db_type = DB_TYPE_TOKUDB;
#else
    tokudb_hton->db_type = DB_TYPE_UNKNOWN;
#endif

    tokudb_hton->create = tokudb_create_handler;
    tokudb_hton->close_connection = tokudb_close_connection;

    tokudb_hton->savepoint_offset = sizeof(SP_INFO_T);
    tokudb_hton->savepoint_set = tokudb_savepoint;
    tokudb_hton->savepoint_rollback = tokudb_rollback_to_savepoint;
    tokudb_hton->savepoint_release = tokudb_release_savepoint;

    tokudb_hton->discover = tokudb_discover;
#if defined(MYSQL_HANDLERTON_INCLUDE_DISCOVER2)
    tokudb_hton->discover2 = tokudb_discover2;
#endif
    tokudb_hton->commit = tokudb_commit;
    tokudb_hton->rollback = tokudb_rollback;
#if TOKU_INCLUDE_XA
    tokudb_hton->prepare=tokudb_xa_prepare;
    tokudb_hton->recover=tokudb_xa_recover;
    tokudb_hton->commit_by_xid=tokudb_commit_by_xid;
    tokudb_hton->rollback_by_xid=tokudb_rollback_by_xid;
#endif

    tokudb_hton->table_options= tokudb_table_options;
    tokudb_hton->index_options= tokudb_index_options;

    tokudb_hton->panic = tokudb_end;
    tokudb_hton->flush_logs = tokudb_flush_logs;
    tokudb_hton->show_status = tokudb_show_status;
    if (!tokudb_home)
        tokudb_home = mysql_real_data_home;
    DBUG_PRINT("info", ("tokudb_home: %s", tokudb_home));
#if 0
    if (!tokudb_log_buffer_size) { // QQQ
        tokudb_log_buffer_size = max(table_cache_size * 512, 32 * 1024);
        DBUG_PRINT("info", ("computing tokudb_log_buffer_size %ld\n", tokudb_log_buffer_size));
    }
    tokudb_log_file_size = tokudb_log_buffer_size * 4;
    tokudb_log_file_size = MY_ALIGN(tokudb_log_file_size, 1024 * 1024L);
    tokudb_log_file_size = max(tokudb_log_file_size, 10 * 1024 * 1024L);
    DBUG_PRINT("info", ("computing tokudb_log_file_size: %ld\n", tokudb_log_file_size));
#endif
    if ((r = db_env_create(&db_env, 0))) {
        DBUG_PRINT("info", ("db_env_create %d\n", r));
        goto error;
    }

    DBUG_PRINT("info", ("tokudb_env_flags: 0x%x\n", tokudb_env_flags));
    r = db_env->set_flags(db_env, tokudb_env_flags, 1);
    if (r) { // QQQ
        if (tokudb_debug & TOKUDB_DEBUG_INIT) 
            TOKUDB_TRACE("%s:WARNING: flags=%x r=%d\n", __FUNCTION__, tokudb_env_flags, r); 
        // goto error;
    }

    // config error handling
    db_env->set_errcall(db_env, tokudb_print_error);
    db_env->set_errpfx(db_env, "TokuDB");

    //
    // set default comparison functions
    //
    r = db_env->set_default_bt_compare(db_env, tokudb_cmp_dbt_key);
    if (r) {
        DBUG_PRINT("info", ("set_default_bt_compare%d\n", r));
        goto error; 
    }

    {
    char *tmp_dir = tokudb_tmp_dir;
    char *data_dir = tokudb_data_dir;
    if (data_dir == 0) {
        data_dir = mysql_data_home;
    }
    if (tmp_dir == 0) {
        tmp_dir = data_dir;
    }
    DBUG_PRINT("info", ("tokudb_data_dir: %s\n", data_dir));
    db_env->set_data_dir(db_env, data_dir);

    DBUG_PRINT("info", ("tokudb_tmp_dir: %s\n", tmp_dir));
    db_env->set_tmp_dir(db_env, tmp_dir);
    }

    if (tokudb_log_dir) {
        DBUG_PRINT("info", ("tokudb_log_dir: %s\n", tokudb_log_dir));
        db_env->set_lg_dir(db_env, tokudb_log_dir);
    }

    // config the cache table size to min(1/2 of physical memory, 1/8 of the process address space)
    if (tokudb_cache_size == 0) {
        uint64_t physmem, maxdata;
        physmem = toku_os_get_phys_memory_size();
        tokudb_cache_size = physmem / 2;
        r = toku_os_get_max_process_data_size(&maxdata);
        if (r == 0) {
            if (tokudb_cache_size > maxdata / 8)
                tokudb_cache_size = maxdata / 8;
        }
    }
    if (tokudb_cache_size) {
        DBUG_PRINT("info", ("tokudb_cache_size: %lld\n", tokudb_cache_size));
        r = db_env->set_cachesize(db_env, (uint32_t)(tokudb_cache_size >> 30), (uint32_t)(tokudb_cache_size % (1024L * 1024L * 1024L)), 1);
        if (r) {
            DBUG_PRINT("info", ("set_cachesize %d\n", r));
            goto error; 
        }
    }
    if (tokudb_max_lock_memory == 0) {
        tokudb_max_lock_memory = tokudb_cache_size/8;
    }
    if (tokudb_max_lock_memory) {
        DBUG_PRINT("info", ("tokudb_max_lock_memory: %lld\n", tokudb_max_lock_memory));
        r = db_env->set_lk_max_memory(db_env, tokudb_max_lock_memory);
        if (r) {
            DBUG_PRINT("info", ("set_lk_max_memory %d\n", r));
            goto error; 
        }
    }
    
    uint32_t gbytes, bytes; int parts;
    r = db_env->get_cachesize(db_env, &gbytes, &bytes, &parts);
    if (r == 0) 
        if (tokudb_debug & TOKUDB_DEBUG_INIT) 
            TOKUDB_TRACE("%s:tokudb_cache_size=%lld\n", __FUNCTION__, ((unsigned long long) gbytes << 30) + bytes);

#if 0
    // QQQ config the logs
    DBUG_PRINT("info", ("tokudb_log_file_size: %ld\n", tokudb_log_file_size));
    db_env->set_lg_max(db_env, tokudb_log_file_size);
    DBUG_PRINT("info", ("tokudb_log_buffer_size: %ld\n", tokudb_log_buffer_size));
    db_env->set_lg_bsize(db_env, tokudb_log_buffer_size);
    // DBUG_PRINT("info",("tokudb_region_size: %ld\n", tokudb_region_size));
    // db_env->set_lg_regionmax(db_env, tokudb_region_size);
#endif

    if (db_env->set_redzone) {
        r = db_env->set_redzone(db_env, tokudb_fs_reserve_percent);
        if (r && (tokudb_debug & TOKUDB_DEBUG_INIT))
            TOKUDB_TRACE("%s:%d r=%d\n", __FUNCTION__, __LINE__, r);
    }

    if (tokudb_debug & TOKUDB_DEBUG_INIT) TOKUDB_TRACE("%s:env open:flags=%x\n", __FUNCTION__, tokudb_init_flags);

    r = db_env->set_generate_row_callback_for_put(db_env,generate_row_for_put);
    assert(r == 0);
    r = db_env->set_generate_row_callback_for_del(db_env,generate_row_for_del);
    assert(r == 0);
    db_env->set_update(db_env, tokudb_update_fun);
    db_env_set_direct_io(tokudb_directio == TRUE);
    db_env->change_fsync_log_period(db_env, tokudb_fsync_log_period);
    r = db_env->open(db_env, tokudb_home, tokudb_init_flags, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);

    if (tokudb_debug & TOKUDB_DEBUG_INIT) TOKUDB_TRACE("%s:env opened:return=%d\n", __FUNCTION__, r);

    if (r) {
        DBUG_PRINT("info", ("env->open %d\n", r));
        goto error;
    }

    r = db_env->checkpointing_set_period(db_env, tokudb_checkpointing_period);
    assert(r == 0);
    r = db_env->cleaner_set_period(db_env, tokudb_cleaner_period);
    assert(r == 0);
    r = db_env->cleaner_set_iterations(db_env, tokudb_cleaner_iterations);
    assert(r == 0);

    r = db_env->set_lock_timeout(db_env, tokudb_lock_timeout);
    assert(r == 0);

    r = db_env->get_engine_status_num_rows (db_env, &toku_global_status_max_rows);
    assert(r == 0);

    {
        const myf mem_flags = MY_FAE|MY_WME|MY_ZEROFILL|MY_ALLOW_ZERO_PTR|MY_FREE_ON_ERROR;
        toku_global_status_variables = (SHOW_VAR*)my_malloc(sizeof(*toku_global_status_variables)*toku_global_status_max_rows, mem_flags);
        toku_global_status_rows = (TOKU_ENGINE_STATUS_ROW_S*)my_malloc(sizeof(*toku_global_status_rows)*toku_global_status_max_rows, mem_flags);
    }

    r = db_create(&metadata_db, db_env, 0);
    if (r) {
        DBUG_PRINT("info", ("failed to create metadata db %d\n", r));
        goto error;
    }
    

    r= metadata_db->open(metadata_db, NULL, TOKU_METADB_NAME, NULL, DB_BTREE, DB_THREAD, 0);
    if (r) {
        if (r != ENOENT) {
            sql_print_error("Got error %d when trying to open metadata_db", r);
            goto error;
        }
        r = metadata_db->close(metadata_db,0);
        assert(r == 0);
        r = db_create(&metadata_db, db_env, 0);
        if (r) {
            DBUG_PRINT("info", ("failed to create metadata db %d\n", r));
            goto error;
        }

        r= metadata_db->open(metadata_db, NULL, TOKU_METADB_NAME, NULL, DB_BTREE, DB_THREAD | DB_CREATE | DB_EXCL, my_umask);
        if (r) {
            goto error;
        }
    }



    tokudb_primary_key_bytes_inserted = create_partitioned_counter();

    //3938: succeeded, set the init status flag and unlock
    tokudb_hton_initialized = 1;
    rw_unlock(&tokudb_hton_initialized_lock);
    DBUG_RETURN(false);

error:
    if (metadata_db) {
        int rr = metadata_db->close(metadata_db, 0);
        assert(rr==0);
    }
    if (db_env) {
        int rr= db_env->close(db_env, 0);
        assert(rr==0);
        db_env = 0;
    }

    // 3938: failed to initialized, drop the flag and lock
    tokudb_hton_initialized = 0;
    rw_unlock(&tokudb_hton_initialized_lock);
    DBUG_RETURN(true);
}

static int tokudb_done_func(void *p) {
    TOKUDB_DBUG_ENTER("tokudb_done_func");
    {
        const myf mem_flags = MY_FAE|MY_WME|MY_ZEROFILL|MY_ALLOW_ZERO_PTR|MY_FREE_ON_ERROR;
        my_free(toku_global_status_variables, mem_flags);
        my_free(toku_global_status_rows, mem_flags);
        toku_global_status_variables = NULL;
        toku_global_status_rows = NULL;
    }
    my_hash_free(&tokudb_open_tables);
    pthread_mutex_destroy(&tokudb_mutex);
    pthread_mutex_destroy(&tokudb_meta_mutex);
#if defined(_WIN64)
    toku_ydb_destroy();
#endif
    TOKUDB_DBUG_RETURN(0);
}

static handler *tokudb_create_handler(handlerton * hton, TABLE_SHARE * table, MEM_ROOT * mem_root) {
    return new(mem_root) ha_tokudb(hton, table);
}

int tokudb_end(handlerton * hton, ha_panic_function type) {
    TOKUDB_DBUG_ENTER("tokudb_end");
    int error = 0;
    
    // 3938: if we finalize the storage engine plugin, it is no longer
    // initialized. grab a writer lock for the duration of the
    // call, so we can drop the flag and destroy the mutexes
    // in isolation.
    rw_wrlock(&tokudb_hton_initialized_lock);
    assert(tokudb_hton_initialized);

    if (metadata_db) {
        int r = metadata_db->close(metadata_db, 0);
        assert(r == 0);
    }
    if (db_env) {
        if (tokudb_init_flags & DB_INIT_LOG)
            tokudb_cleanup_log_files();
        error = db_env->close(db_env, 0);       // Error is logged
        assert(error==0);
        db_env = NULL;
    }

    // 3938: drop the initialized flag and unlock
    tokudb_hton_initialized = 0;
    rw_unlock(&tokudb_hton_initialized_lock);

    TOKUDB_DBUG_RETURN(error);
}

static int tokudb_close_connection(handlerton * hton, THD * thd) {
    int error = 0;
    tokudb_trx_data* trx = NULL;
    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
    if (trx && trx->checkpoint_lock_taken) {
        error = db_env->checkpointing_resume(db_env);
    }
    my_free(trx, MYF(0));
    return error;
}

bool tokudb_flush_logs(handlerton * hton) {
    TOKUDB_DBUG_ENTER("tokudb_flush_logs");
    int error;
    bool result = 0;

    if (tokudb_checkpoint_on_flush_logs) {
        //
        // take the checkpoint
        //
        error = db_env->txn_checkpoint(db_env, 0, 0, 0);
        if (error) {
            my_error(ER_ERROR_DURING_CHECKPOINT, MYF(0), error);
            result = 1;
            goto exit;
        }
    }
    else {
        error = db_env->log_flush(db_env, NULL);
        assert(error == 0);
    }

    result = 0;
exit:
    TOKUDB_DBUG_RETURN(result);
}

uint get_pk_insert_mode(THD* thd) {
    return THDVAR(thd, pk_insert_mode);
}

bool get_load_save_space(THD* thd) {
    return (THDVAR(thd, load_save_space) != 0);
}

bool get_disable_slow_alter(THD* thd) {
    return (THDVAR(thd, disable_slow_alter) != 0);
}

bool get_disable_hot_alter(THD* thd) {
    return THDVAR(thd, disable_hot_alter) != 0;
}

bool get_create_index_online(THD* thd) {
    return (THDVAR(thd, create_index_online) != 0);
}

bool get_disable_prefetching(THD* thd) {
    return (THDVAR(thd, disable_prefetching) != 0);
}

bool get_prelock_empty(THD* thd) {
    return (THDVAR(thd, prelock_empty) != 0);
}

bool get_log_client_errors(THD* thd) {
    return (THDVAR(thd, log_client_errors) != 0);
}

uint get_tokudb_block_size(THD* thd) {
    return THDVAR(thd, block_size);
}

uint get_tokudb_read_block_size(THD* thd) {
    return THDVAR(thd, read_block_size);
}

uint get_tokudb_read_buf_size(THD* thd) {
    return THDVAR(thd, read_buf_size);
}

#if TOKU_INCLUDE_UPSERT
bool get_disable_slow_update(THD *thd) {
    return (THDVAR(thd, disable_slow_update) != 0);
}

bool get_disable_slow_upsert(THD *thd) {
    return (THDVAR(thd, disable_slow_upsert) != 0);
}
#endif
uint get_analyze_time(THD *thd) {
    return THDVAR(thd, analyze_time);
}

typedef struct txn_progress_info {
    char status[200];
    THD* thd;
} *TXN_PROGRESS_INFO;


void txn_progress_func(TOKU_TXN_PROGRESS progress, void* extra) {
    TXN_PROGRESS_INFO progress_info = (TXN_PROGRESS_INFO)extra;
    int r;
    if (progress->stalled_on_checkpoint) {
        if (progress->is_commit) {
            r = sprintf(
                progress_info->status, 
                "Writing committed changes to disk, processing commit of transaction, %"PRId64" out of %"PRId64, 
                progress->entries_processed, 
                progress->entries_total
                ); 
            assert(r >= 0);
        }
        else {
            r = sprintf(
                progress_info->status, 
                "Writing committed changes to disk, processing abort of transaction, %"PRId64" out of %"PRId64, 
                progress->entries_processed, 
                progress->entries_total
                ); 
            assert(r >= 0);
        }
    }
    else {
        if (progress->is_commit) {
            r = sprintf(
                progress_info->status, 
                "processing commit of transaction, %"PRId64" out of %"PRId64, 
                progress->entries_processed, 
                progress->entries_total
                ); 
            assert(r >= 0);
        }
        else {
            r = sprintf(
                progress_info->status, 
                "processing abort of transaction, %"PRId64" out of %"PRId64, 
                progress->entries_processed, 
                progress->entries_total
                ); 
            assert(r >= 0);
        }
    }
    thd_proc_info(progress_info->thd, progress_info->status);
}


static void commit_txn_with_progress(DB_TXN* txn, uint32_t flags, THD* thd) {
    int r;
    struct txn_progress_info info;
    info.thd = thd;
    r = txn->commit_with_progress(txn, flags, txn_progress_func, &info);
    if (r != 0) {
        sql_print_error("tried committing transaction %p and got error code %d", txn, r);
    }
    assert(r == 0);
}

static void abort_txn_with_progress(DB_TXN* txn, THD* thd) {
    int r;
    struct txn_progress_info info;
    info.thd = thd;
    r = txn->abort_with_progress(txn, txn_progress_func, &info);
    if (r != 0) {
        sql_print_error("tried aborting transaction %p and got error code %d", txn, r);
    }
    assert(r == 0);
}

static int tokudb_commit(handlerton * hton, THD * thd, bool all) {
    TOKUDB_DBUG_ENTER("tokudb_commit");
    DBUG_PRINT("trans", ("ending transaction %s", all ? "all" : "stmt"));
    uint32_t syncflag = THDVAR(thd, commit_sync) ? 0 : DB_TXN_NOSYNC;
    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    DB_TXN **txn = all ? &trx->all : &trx->stmt;
    if (*txn) {
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("doing txn commit:%d:%p\n", all, *txn);
        }
        // test hook to induce a crash on a debug build
        DBUG_EXECUTE_IF("tokudb_crash_commit_before", DBUG_SUICIDE(););
        commit_txn_with_progress(*txn, syncflag, thd);
        // test hook to induce a crash on a debug build
        DBUG_EXECUTE_IF("tokudb_crash_commit_after", DBUG_SUICIDE(););
        if (*txn == trx->sp_level) {
            trx->sp_level = 0;
        }
        *txn = 0;
        trx->sub_sp_level = NULL;
    } 
    else if (tokudb_debug & TOKUDB_DEBUG_TXN) {
        TOKUDB_TRACE("nothing to commit %d\n", all);
    }
    reset_stmt_progress(&trx->stmt_progress);
    TOKUDB_DBUG_RETURN(0);
}

static int tokudb_rollback(handlerton * hton, THD * thd, bool all) {
    TOKUDB_DBUG_ENTER("tokudb_rollback");
    DBUG_PRINT("trans", ("aborting transaction %s", all ? "all" : "stmt"));
    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    DB_TXN **txn = all ? &trx->all : &trx->stmt;
    if (*txn) {
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("rollback:%p\n", *txn);
        }
        abort_txn_with_progress(*txn, thd);
        if (*txn == trx->sp_level) {
            trx->sp_level = 0;
        }
        *txn = 0;
        trx->sub_sp_level = NULL;
    } 
    else {
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("abort0\n");
        }
    }
    reset_stmt_progress(&trx->stmt_progress);
    TOKUDB_DBUG_RETURN(0);
}

#if TOKU_INCLUDE_XA

static int tokudb_xa_prepare(handlerton* hton, THD* thd, bool all) {
    TOKUDB_DBUG_ENTER("tokudb_xa_prepare");
    int r = 0;
    DBUG_PRINT("trans", ("preparing transaction %s", all ? "all" : "stmt"));
    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    DB_TXN* txn = all ? trx->all : trx->stmt;
    if (txn) {
        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
            TOKUDB_TRACE("doing txn prepare:%d:%p\n", all, txn);
        }
        // a TOKU_XA_XID is identical to a MYSQL_XID
        TOKU_XA_XID thd_xid;
        thd_get_xid(thd, (MYSQL_XID*) &thd_xid);
        // test hook to induce a crash on a debug build
        DBUG_EXECUTE_IF("tokudb_crash_prepare_before", DBUG_SUICIDE(););
        r = txn->xa_prepare(txn, &thd_xid);
        // test hook to induce a crash on a debug build
        DBUG_EXECUTE_IF("tokudb_crash_prepare_after", DBUG_SUICIDE(););
    } 
    else if (tokudb_debug & TOKUDB_DEBUG_TXN) {
        TOKUDB_TRACE("nothing to prepare %d\n", all);
    }
    TOKUDB_DBUG_RETURN(r);
}

static int tokudb_xa_recover(handlerton* hton, XID*  xid_list, uint  len) {
    TOKUDB_DBUG_ENTER("tokudb_xa_recover");
    int r = 0;
    if (len == 0 || xid_list == NULL) {
        TOKUDB_DBUG_RETURN(0);
    }
    long num_returned = 0;
    r = db_env->txn_xa_recover(
        db_env,
        (TOKU_XA_XID*)xid_list,
        len,
        &num_returned,
        DB_NEXT
        );
    assert(r == 0);
    TOKUDB_DBUG_RETURN((int)num_returned);
}

static int tokudb_commit_by_xid(handlerton* hton, XID* xid) {
    TOKUDB_DBUG_ENTER("tokudb_commit_by_xid");
    int r = 0;
    DB_TXN* txn = NULL;
    TOKU_XA_XID* toku_xid = (TOKU_XA_XID*)xid;

    r = db_env->get_txn_from_xid(db_env, toku_xid, &txn);
    if (r) { goto cleanup; }

    r = txn->commit(txn, 0);
    if (r) { goto cleanup; }

    r = 0;
cleanup:
    TOKUDB_DBUG_RETURN(r);
}

static int tokudb_rollback_by_xid(handlerton* hton, XID*  xid) {
    TOKUDB_DBUG_ENTER("tokudb_rollback_by_xid");
    int r = 0;
    DB_TXN* txn = NULL;
    TOKU_XA_XID* toku_xid = (TOKU_XA_XID*)xid;

    r = db_env->get_txn_from_xid(db_env, toku_xid, &txn);
    if (r) { goto cleanup; }

    r = txn->abort(txn);
    if (r) { goto cleanup; }

    r = 0;
cleanup:
    TOKUDB_DBUG_RETURN(r);
}

#endif

static int tokudb_savepoint(handlerton * hton, THD * thd, void *savepoint) {
    TOKUDB_DBUG_ENTER("tokudb_savepoint");
    int error;
    SP_INFO save_info = (SP_INFO)savepoint;
    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    if (thd->in_sub_stmt) {
        assert(trx->stmt);
        error = db_env->txn_begin(db_env, trx->sub_sp_level, &(save_info->txn), DB_INHERIT_ISOLATION);
        if (error) {
            goto cleanup;
        }
        trx->sub_sp_level = save_info->txn;
        save_info->in_sub_stmt = true;
    }
    else {
        error = db_env->txn_begin(db_env, trx->sp_level, &(save_info->txn), DB_INHERIT_ISOLATION);
        if (error) {
            goto cleanup;
        }
        trx->sp_level = save_info->txn;
        save_info->in_sub_stmt = false;
    }
    save_info->trx = trx;
    error = 0;
cleanup:
    TOKUDB_DBUG_RETURN(error);
}

static int tokudb_rollback_to_savepoint(handlerton * hton, THD * thd, void *savepoint) {
    TOKUDB_DBUG_ENTER("tokudb_rollback_to_savepoint");
    int error;
    SP_INFO save_info = (SP_INFO)savepoint;
    DB_TXN* parent = NULL;
    DB_TXN* txn_to_rollback = save_info->txn;

    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    parent = txn_to_rollback->parent;
    if (!(error = txn_to_rollback->abort(txn_to_rollback))) {
        if (save_info->in_sub_stmt) {
            trx->sub_sp_level = parent;
        }
        else {
            trx->sp_level = parent;
        }
        error = tokudb_savepoint(hton, thd, savepoint);
    }
    TOKUDB_DBUG_RETURN(error);
}

static int tokudb_release_savepoint(handlerton * hton, THD * thd, void *savepoint) {
    TOKUDB_DBUG_ENTER("tokudb_release_savepoint");
    int error;

    SP_INFO save_info = (SP_INFO)savepoint;
    DB_TXN* parent = NULL;
    DB_TXN* txn_to_commit = save_info->txn;

    tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
    parent = txn_to_commit->parent;
    if (!(error = txn_to_commit->commit(txn_to_commit, 0))) {
        if (save_info->in_sub_stmt) {
            trx->sub_sp_level = parent;
        }
        else {
            trx->sp_level = parent;
        }
        save_info->txn = NULL;
    }
    TOKUDB_DBUG_RETURN(error);
}

static int tokudb_discover(handlerton *hton, THD* thd, const char *db, const char *name, uchar **frmblob, size_t *frmlen) {
    return tokudb_discover2(hton, thd, db, name, true, frmblob, frmlen);
}

static int tokudb_discover2(handlerton *hton, THD* thd, const char *db, const char *name, bool translate_name,
                            uchar **frmblob, size_t *frmlen) {
    TOKUDB_DBUG_ENTER("tokudb_discover");
    int error;
    DB* status_db = NULL;
    DB_TXN* txn = NULL;
    char path[FN_REFLEN + 1];
    HA_METADATA_KEY curr_key = hatoku_frm_data;
    DBT key, value;    
    memset(&key, 0, sizeof(key));
    memset(&value, 0, sizeof(&value));
    
    error = db_env->txn_begin(db_env, 0, &txn, 0);
    if (error) { goto cleanup; }

    build_table_filename(path, sizeof(path) - 1, db, name, "", translate_name ? 0 : FN_IS_TMP);
    error = open_status_dictionary(&status_db, path, txn);
    if (error) { goto cleanup; }

    key.data = &curr_key;
    key.size = sizeof(curr_key);

    error = status_db->getf_set(
        status_db, 
        txn,
        0,
        &key, 
        smart_dbt_callback_verify_frm,
        &value
        );
    if (error) {
        goto cleanup;
    }

    *frmblob = (uchar *)value.data;
    *frmlen = value.size;

    error = 0;
cleanup:
    if (status_db) {
        status_db->close(status_db,0);
    }
    if (txn) {
        commit_txn(txn, 0);
    }
    TOKUDB_DBUG_RETURN(error);    
}

static int store_dbname_tablename_size(TABLE *table, char *name, uint64_t size, THD *thd) {
    char *tp = strrchr(name, '/');
    assert(tp);
    char *tablename = tp + 1;
    size_t tablename_length = strlen(tablename);

    char *dp = strchr(name, '/');
    char *dbname;
    size_t dbname_length;
    if (dp == tp) {
        dbname = name;
        dbname_length = tp - dbname;
    } else {
        dbname = dp + 1;
        dbname_length = tp - dbname;
    }

    table->field[0]->store(dbname, dbname_length, system_charset_info);
    table->field[1]->store(tablename, tablename_length, system_charset_info);
    table->field[2]->store(size, false);
    int error = schema_table_store_record(thd, table);
    return error;
}

static int tokudb_dictionary_info(TABLE *table, THD *thd) {
    int error;
    DB_TXN* txn = NULL;
    DBC* tmp_cursor = NULL;
    DBT curr_key;
    DBT curr_val;
    memset(&curr_key, 0, sizeof curr_key); 
    memset(&curr_val, 0, sizeof curr_val);
    error = db_env->txn_begin(db_env, 0, &txn, DB_READ_UNCOMMITTED);
    if (error) {
        goto cleanup;
    }
    error = db_env->get_cursor_for_directory(db_env, txn, &tmp_cursor);
    if (error) {
        goto cleanup;
    }
    while (error == 0) {
        error = tmp_cursor->c_get(
            tmp_cursor, 
            &curr_key, 
            &curr_val, 
            DB_NEXT
            );
        if (!error) {
            // We store the NULL terminator in the directory so it's included in the size.
            // See #5789
            // Recalculate and check just to be safe.
            size_t dname_len = strlen((const char *)curr_key.data);
            size_t iname_len = strlen((const char *)curr_val.data);
            assert(dname_len == curr_key.size - 1);
            assert(iname_len == curr_val.size - 1);
            table->field[0]->store(
                (char *)curr_key.data,
                dname_len,
                system_charset_info
                );
            table->field[1]->store(
                (char *)curr_val.data,
                iname_len,
                system_charset_info
                );
            error = schema_table_store_record(thd, table);
        }
    }
    if (error == DB_NOTFOUND) {
        error = 0;
    }
cleanup:
    if (tmp_cursor) {
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r == 0);
    }
    if (txn) {
        commit_txn(txn, 0);
    }
    return error;
}

static int tokudb_report_fractal_tree_info_for_db(const DBT *dname, const DBT *iname, TABLE *table, THD *thd) {
    int error;
    DB *db;
    uint64_t bt_num_blocks_allocated;
    uint64_t bt_num_blocks_in_use;
    uint64_t bt_size_allocated;
    uint64_t bt_size_in_use;

    error = db_create(&db, db_env, 0);
    if (error) {
        goto exit;
    }
    error = db->open(db, NULL, (char *)dname->data, NULL, DB_BTREE, 0, 0666);
    if (error) {
        goto exit;
    }
    error = db->get_fractal_tree_info64(db,
                                        &bt_num_blocks_allocated, &bt_num_blocks_in_use,
                                        &bt_size_allocated, &bt_size_in_use);
    {
        int close_error = db->close(db, 0);
        if (!error) {
            error = close_error;
        }
    }
    if (error) {
        goto exit;
    }

    // We store the NULL terminator in the directory so it's included in the size.
    // See #5789
    // Recalculate and check just to be safe.
    {
        size_t dname_len = strlen((const char *)dname->data);
        size_t iname_len = strlen((const char *)iname->data);
        assert(dname_len == dname->size - 1);
        assert(iname_len == iname->size - 1);
        table->field[0]->store(
            (char *)dname->data,
            dname_len,
            system_charset_info
            );
        table->field[1]->store(
            (char *)iname->data,
            iname_len,
            system_charset_info
            );
    }
    table->field[2]->store(bt_num_blocks_allocated, false);
    table->field[3]->store(bt_num_blocks_in_use, false);
    table->field[4]->store(bt_size_allocated, false);
    table->field[5]->store(bt_size_in_use, false);

    error = schema_table_store_record(thd, table);

exit:
    return error;
}

static int tokudb_fractal_tree_info(TABLE *table, THD *thd) {
    int error;
    DB_TXN* txn = NULL;
    DBC* tmp_cursor = NULL;
    DBT curr_key;
    DBT curr_val;
    memset(&curr_key, 0, sizeof curr_key);
    memset(&curr_val, 0, sizeof curr_val);
    error = db_env->txn_begin(db_env, 0, &txn, DB_READ_UNCOMMITTED);
    if (error) {
        goto cleanup;
    }
    error = db_env->get_cursor_for_directory(db_env, txn, &tmp_cursor);
    if (error) {
        goto cleanup;
    }
    while (error == 0) {
        error = tmp_cursor->c_get(
            tmp_cursor,
            &curr_key,
            &curr_val,
            DB_NEXT
            );
        if (!error) {
            error = tokudb_report_fractal_tree_info_for_db(&curr_key, &curr_val, table, thd);
        }
    }
    if (error == DB_NOTFOUND) {
        error = 0;
    }
cleanup:
    if (tmp_cursor) {
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r == 0);
    }
    if (txn) {
        commit_txn(txn, 0);
    }
    return error;
}

struct tokudb_report_fractal_tree_block_map_iterator_extra {
    int64_t num_rows;
    int64_t i;
    uint64_t *checkpoint_counts;
    int64_t *blocknums;
    int64_t *diskoffs;
    int64_t *sizes;
};

// This iterator is called while holding the blocktable lock.  We should be as quick as possible.
// We don't want to do one call to get the number of rows, release the blocktable lock, and then do another call to get all the rows because the number of rows may change if we don't hold the lock.
// As a compromise, we'll do some mallocs inside the lock on the first call, but everything else should be fast.
static int tokudb_report_fractal_tree_block_map_iterator(uint64_t checkpoint_count,
                                                          int64_t num_rows,
                                                          int64_t blocknum,
                                                          int64_t diskoff,
                                                          int64_t size,
                                                          void *iter_extra) {
    struct tokudb_report_fractal_tree_block_map_iterator_extra *e = static_cast<struct tokudb_report_fractal_tree_block_map_iterator_extra *>(iter_extra);

    assert(num_rows > 0);
    if (e->num_rows == 0) {
        e->checkpoint_counts = (uint64_t *) my_malloc(num_rows * (sizeof *e->checkpoint_counts), MYF(MY_WME|MY_ZEROFILL|MY_FAE));
        e->blocknums = (int64_t *) my_malloc(num_rows * (sizeof *e->blocknums), MYF(MY_WME|MY_ZEROFILL|MY_FAE));
        e->diskoffs = (int64_t *) my_malloc(num_rows * (sizeof *e->diskoffs), MYF(MY_WME|MY_ZEROFILL|MY_FAE));
        e->sizes = (int64_t *) my_malloc(num_rows * (sizeof *e->sizes), MYF(MY_WME|MY_ZEROFILL|MY_FAE));
        e->num_rows = num_rows;
    }

    e->checkpoint_counts[e->i] = checkpoint_count;
    e->blocknums[e->i] = blocknum;
    e->diskoffs[e->i] = diskoff;
    e->sizes[e->i] = size;
    ++(e->i);

    return 0;
}

static int tokudb_report_fractal_tree_block_map_for_db(const DBT *dname, const DBT *iname, TABLE *table, THD *thd) {
    int error;
    DB *db;
    struct tokudb_report_fractal_tree_block_map_iterator_extra e = {}; // avoid struct initializers so that we can compile with older gcc versions

    error = db_create(&db, db_env, 0);
    if (error) {
        goto exit;
    }
    error = db->open(db, NULL, (char *)dname->data, NULL, DB_BTREE, 0, 0666);
    if (error) {
        goto exit;
    }
    error = db->iterate_fractal_tree_block_map(db, tokudb_report_fractal_tree_block_map_iterator, &e);
    {
        int close_error = db->close(db, 0);
        if (!error) {
            error = close_error;
        }
    }
    if (error) {
        goto exit;
    }

    // If not, we should have gotten an error and skipped this section of code
    assert(e.i == e.num_rows);
    for (int64_t i = 0; error == 0 && i < e.num_rows; ++i) {
        // We store the NULL terminator in the directory so it's included in the size.
        // See #5789
        // Recalculate and check just to be safe.
        size_t dname_len = strlen((const char *)dname->data);
        size_t iname_len = strlen((const char *)iname->data);
        assert(dname_len == dname->size - 1);
        assert(iname_len == iname->size - 1);
        table->field[0]->store(
            (char *)dname->data,
            dname_len,
            system_charset_info
            );
        table->field[1]->store(
            (char *)iname->data,
            iname_len,
            system_charset_info
            );
        table->field[2]->store(e.checkpoint_counts[i], false);
        table->field[3]->store(e.blocknums[i], false);
        static const int64_t freelist_null = -1;
        static const int64_t diskoff_unused = -2;
        if (e.diskoffs[i] == diskoff_unused || e.diskoffs[i] == freelist_null) {
            table->field[4]->set_null();
        } else {
            table->field[4]->set_notnull();
            table->field[4]->store(e.diskoffs[i], false);
        }
        static const int64_t size_is_free = -1;
        if (e.sizes[i] == size_is_free) {
            table->field[5]->set_null();
        } else {
            table->field[5]->set_notnull();
            table->field[5]->store(e.sizes[i], false);
        }

        error = schema_table_store_record(thd, table);
    }

exit:
    if (e.checkpoint_counts != NULL) {
        my_free(e.checkpoint_counts, MYF(0));
        e.checkpoint_counts = NULL;
    }
    if (e.blocknums != NULL) {
        my_free(e.blocknums, MYF(0));
        e.blocknums = NULL;
    }
    if (e.diskoffs != NULL) {
        my_free(e.diskoffs, MYF(0));
        e.diskoffs = NULL;
    }
    if (e.sizes != NULL) {
        my_free(e.sizes, MYF(0));
        e.sizes = NULL;
    }
    return error;
}

static int tokudb_fractal_tree_block_map(TABLE *table, THD *thd) {
    int error;
    DB_TXN* txn = NULL;
    DBC* tmp_cursor = NULL;
    DBT curr_key;
    DBT curr_val;
    memset(&curr_key, 0, sizeof curr_key);
    memset(&curr_val, 0, sizeof curr_val);
    error = db_env->txn_begin(db_env, 0, &txn, DB_READ_UNCOMMITTED);
    if (error) {
        goto cleanup;
    }
    error = db_env->get_cursor_for_directory(db_env, txn, &tmp_cursor);
    if (error) {
        goto cleanup;
    }
    while (error == 0) {
        error = tmp_cursor->c_get(
            tmp_cursor,
            &curr_key,
            &curr_val,
            DB_NEXT
            );
        if (!error) {
            error = tokudb_report_fractal_tree_block_map_for_db(&curr_key, &curr_val, table, thd);
        }
    }
    if (error == DB_NOTFOUND) {
        error = 0;
    }
cleanup:
    if (tmp_cursor) {
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r == 0);
    }
    if (txn) {
        commit_txn(txn, 0);
    }
    return error;
}

static int tokudb_get_user_data_size(TABLE *table, THD *thd, bool exact) {
    int error;
    DB* curr_db = NULL;
    DB_TXN* txn = NULL;
    DBC* tmp_cursor = NULL;
    DBC* tmp_table_cursor = NULL;
    DBT curr_key;
    DBT curr_val;
    DB_TXN* tmp_txn = NULL;
    memset(&curr_key, 0, sizeof curr_key); 
    memset(&curr_val, 0, sizeof curr_val);
    pthread_mutex_lock(&tokudb_meta_mutex);

    error = db_env->txn_begin(db_env, 0, &txn, DB_READ_UNCOMMITTED);
    if (error) {
        goto cleanup;
    }
    error = metadata_db->cursor(metadata_db, txn, &tmp_cursor, 0);
    if (error) {
        goto cleanup;
    }
    while (error == 0) {
        tmp_txn = NULL;
        //
        // here, and in other places, check if process has been killed
        // if so, get out of function so user is not stalled
        //
        if (thd->killed) {
            break;
        }
        error = db_env->txn_begin(db_env, 0, &tmp_txn, DB_READ_UNCOMMITTED);
        if (error) {
            goto cleanup;
        }

        //
        // do not need this to be super fast, so use old simple API
        //
        error = tmp_cursor->c_get(
            tmp_cursor, 
            &curr_key, 
            &curr_val, 
            DB_NEXT
            );
        if (!error) {
            char* name = (char *)curr_key.data;
            char* newname;
            uint64_t curr_num_bytes = 0;
            DB_BTREE_STAT64 dict_stats;

            error = db_create(&curr_db, db_env, 0);
            if (error) { goto cleanup; }

            newname = (char *)my_malloc(
                get_max_dict_name_path_length(name),
                MYF(MY_WME|MY_ZEROFILL|MY_FAE));

            make_name(newname, name, "main");
            
            error = curr_db->open(curr_db, tmp_txn, newname, NULL, DB_BTREE, DB_THREAD, 0);

            my_free(newname, MYF(0));

            if (error == ENOENT) { error = 0; continue; }
            if (error) { goto cleanup; }

            if (exact) {
                //
                // flatten if exact is required
                //
                uint curr_num_items = 0;                
                error = curr_db->cursor(curr_db, tmp_txn, &tmp_table_cursor, 0);
                if (error) {
                    tmp_table_cursor = NULL;
                    goto cleanup;
                }
                while (error != DB_NOTFOUND) {
                    error = tmp_table_cursor->c_getf_next(tmp_table_cursor, 0, smart_dbt_do_nothing, NULL);
                    if (error && error != DB_NOTFOUND) {
                        goto cleanup;
                    }
                    curr_num_items++;
                    //
                    // allow early exit if command has been killed
                    //
                    if ( (curr_num_items % 1000) == 0 && thd->killed) {
                        goto cleanup;
                    }
                }
                error = tmp_table_cursor->c_close(tmp_table_cursor);
                assert(error==0);
                tmp_table_cursor = NULL;
            }

            error = curr_db->stat64(
                curr_db, 
                tmp_txn, 
                &dict_stats
                );
            if (error) { goto cleanup; }

            curr_num_bytes = dict_stats.bt_dsize;
            if (*(uchar *)curr_val.data) {
                //
                // in this case, we have a hidden primary key, do not
                // want to report space taken up by the hidden primary key to the user
                //
                uint64_t hpk_space = TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH*dict_stats.bt_ndata;
                curr_num_bytes = (hpk_space > curr_num_bytes) ? 0 : curr_num_bytes - hpk_space;
            }
            else {
                //
                // one infinity byte per key needs to be subtracted
                //
                uint64_t inf_byte_space = dict_stats.bt_ndata;
                curr_num_bytes = (inf_byte_space > curr_num_bytes) ? 0 : curr_num_bytes - inf_byte_space;
            }

            error = store_dbname_tablename_size(table, name, curr_num_bytes, thd);
            if (error) goto cleanup;

            {
                int r = curr_db->close(curr_db, 0);
                assert(r == 0);
                curr_db = NULL;
            }
        }

        if (tmp_txn) {
            commit_txn(tmp_txn, 0);
            tmp_txn = NULL;
        }
    }

    error = 0;

cleanup:
    if (tmp_cursor) {
        int r = tmp_cursor->c_close(tmp_cursor);
        assert(r == 0);
    }
    if (tmp_table_cursor) {
        int r = tmp_table_cursor->c_close(tmp_table_cursor);
        assert(r == 0);
    }
    if (curr_db) {
        int r = curr_db->close(curr_db, 0);
        assert(r == 0);
    }
    if (tmp_txn) {
        commit_txn(tmp_txn, 0);
    }
    if (txn) {
        commit_txn(txn, 0);
    }
    if (error) {
        sql_print_error("got an error %d in show_data_size\n", error);
    }
    pthread_mutex_unlock(&tokudb_meta_mutex);
    return error;
}

#define STATPRINT(legend, val) if (legend != NULL && val != NULL) stat_print(thd,   \
                                          tokudb_hton_name, \
                                          strlen(tokudb_hton_name), \
                                          legend, \
                                          strlen(legend), \
                                          val, \
                                          strlen(val))

extern sys_var *intern_find_sys_var(const char *str, uint length, bool no_error);

static bool tokudb_show_engine_status(THD * thd, stat_print_fn * stat_print) {
    TOKUDB_DBUG_ENTER("tokudb_show_engine_status");
    int error;
    uint64_t panic;
    const int panic_string_len = 1024;
    char panic_string[panic_string_len] = {'\0'};
    uint64_t num_rows;
    uint64_t max_rows;
    fs_redzone_state redzone_state;
    const int bufsiz = 1024;
    char buf[bufsiz];

#if MYSQL_VERSION_ID < 50500
    {
        sys_var * version = intern_find_sys_var("version", 0, false);
        snprintf(buf, bufsiz, "%s", version->value_ptr(thd, (enum_var_type)0, (LEX_STRING*)NULL));
        STATPRINT("Version", buf);
    }
#endif
    error = db_env->get_engine_status_num_rows (db_env, &max_rows);
    TOKU_ENGINE_STATUS_ROW_S mystat[max_rows];
    error = db_env->get_engine_status (db_env, mystat, max_rows, &num_rows, &redzone_state, &panic, panic_string, panic_string_len, TOKU_ENGINE_STATUS);

    if (strlen(panic_string)) {
        STATPRINT("Environment panic string", panic_string);
    }
    if (error == 0) {
        if (panic) {
            snprintf(buf, bufsiz, "%" PRIu64, panic);
            STATPRINT("Environment panic", buf);
        }
        
        if(redzone_state == FS_BLOCKED) {
            STATPRINT("*** URGENT WARNING ***", "FILE SYSTEM IS COMPLETELY FULL");
            snprintf(buf, bufsiz, "FILE SYSTEM IS COMPLETELY FULL");
        }
        else if (redzone_state == FS_GREEN) {
            snprintf(buf, bufsiz, "more than %d percent of total file system space", 2*tokudb_fs_reserve_percent);
        }
        else if (redzone_state == FS_YELLOW) {
            snprintf(buf, bufsiz, "*** WARNING *** FILE SYSTEM IS GETTING FULL (less than %d percent free)", 2*tokudb_fs_reserve_percent);
        } 
        else if (redzone_state == FS_RED){
            snprintf(buf, bufsiz, "*** WARNING *** FILE SYSTEM IS GETTING VERY FULL (less than %d percent free): INSERTS ARE PROHIBITED", tokudb_fs_reserve_percent);
        }
        else {
            snprintf(buf, bufsiz, "information unavailable, unknown redzone state %d", redzone_state);
        }
        STATPRINT ("disk free space", buf);

        for (uint64_t row = 0; row < num_rows; row++) {
            switch (mystat[row].type) {
            case FS_STATE:
                snprintf(buf, bufsiz, "%"PRIu64"", mystat[row].value.num);
                break;
            case UINT64:
                snprintf(buf, bufsiz, "%"PRIu64"", mystat[row].value.num);
                break;
            case CHARSTR:
                snprintf(buf, bufsiz, "%s", mystat[row].value.str);
                break;
            case UNIXTIME:
                {
                    time_t t = mystat[row].value.num;
                    char tbuf[26];
                    snprintf(buf, bufsiz, "%.24s", ctime_r(&t, tbuf));
                }
                break;
            case TOKUTIME:
                {
                    double t = tokutime_to_seconds(mystat[row].value.num);
                    snprintf(buf, bufsiz, "%.6f", t);
                }
                break;
            case PARCOUNT:
                {
                    uint64_t v = read_partitioned_counter(mystat[row].value.parcount);
                    snprintf(buf, bufsiz, "%" PRIu64, v);
                }
                break;
            default:
                snprintf(buf, bufsiz, "UNKNOWN STATUS TYPE: %d", mystat[row].type);
                break;                
            }
            STATPRINT(mystat[row].legend, buf);
        }
        uint64_t bytes_inserted = read_partitioned_counter(tokudb_primary_key_bytes_inserted);
        snprintf(buf, bufsiz, "%" PRIu64, bytes_inserted);
        STATPRINT("handlerton: primary key bytes inserted", buf);
    }  
    if (error) { my_errno = error; }
    TOKUDB_DBUG_RETURN(error);
}

static void tokudb_checkpoint_lock(THD * thd) {
    int error;
    tokudb_trx_data* trx = NULL;
    char status_msg[200]; //buffer of 200 should be a good upper bound.
    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
    if (!trx) {
        error = create_tokudb_trx_data_instance(&trx);
        //
        // can only fail due to memory allocation, so ok to assert
        //
        assert(!error);
        thd_data_set(thd, tokudb_hton->slot, trx);
    }
    
    if (trx->checkpoint_lock_taken) {
        goto cleanup;
    }
    //
    // This can only fail if environment is not created, which is not possible
    // in handlerton
    //
    sprintf(status_msg, "Trying to grab checkpointing lock.");
    thd_proc_info(thd, status_msg);
    error = db_env->checkpointing_postpone(db_env);
    assert(!error);

    trx->checkpoint_lock_taken = true;
cleanup:
    return;
}

static void tokudb_checkpoint_unlock(THD * thd) {
    int error;
    char status_msg[200]; //buffer of 200 should be a good upper bound.
    tokudb_trx_data* trx = NULL;
    trx = (tokudb_trx_data *) thd_data_get(thd, tokudb_hton->slot);
    if (!trx) {
        error = 0;
        goto  cleanup;
    }
    if (!trx->checkpoint_lock_taken) {
        error = 0;
        goto  cleanup;
    }
    //
    // at this point, we know the checkpoint lock has been taken
    //
    sprintf(status_msg, "Trying to release checkpointing lock.");
    thd_proc_info(thd, status_msg);
    error = db_env->checkpointing_resume(db_env);
    assert(!error);

    trx->checkpoint_lock_taken = false;
    
cleanup:
    return;
}

static bool tokudb_show_status(handlerton * hton, THD * thd, stat_print_fn * stat_print, enum ha_stat_type stat_type) {
    switch (stat_type) {
    case HA_ENGINE_STATUS:
        return tokudb_show_engine_status(thd, stat_print);
        break;
    default:
        break;
    }
    return false;
}

static void tokudb_print_error(const DB_ENV * db_env, const char *db_errpfx, const char *buffer) {
    sql_print_error("%s:  %s", db_errpfx, buffer);
}

static void tokudb_cleanup_log_files(void) {
    TOKUDB_DBUG_ENTER("tokudb_cleanup_log_files");
    char **names;
    int error;

    if ((error = db_env->txn_checkpoint(db_env, 0, 0, 0)))
        my_error(ER_ERROR_DURING_CHECKPOINT, MYF(0), error);

    if ((error = db_env->log_archive(db_env, &names, 0)) != 0) {
        DBUG_PRINT("error", ("log_archive failed (error %d)", error));
        db_env->err(db_env, error, "log_archive");
        DBUG_VOID_RETURN;
    }

    if (names) {
        char **np;
        for (np = names; *np; ++np) {
#if 1
            if (tokudb_debug)
                TOKUDB_TRACE("%s:cleanup:%s\n", __FUNCTION__, *np);
#else
            my_delete(*np, MYF(MY_WME));
#endif
        }

        free(names);
    }

    DBUG_VOID_RETURN;
}

// options flags
//   PLUGIN_VAR_THDLOCAL  Variable is per-connection
//   PLUGIN_VAR_READONLY  Server variable is read only
//   PLUGIN_VAR_NOSYSVAR  Not a server variable
//   PLUGIN_VAR_NOCMDOPT  Not a command line option
//   PLUGIN_VAR_NOCMDARG  No argument for cmd line
//   PLUGIN_VAR_RQCMDARG  Argument required for cmd line
//   PLUGIN_VAR_OPCMDARG  Argument optional for cmd line
//   PLUGIN_VAR_MEMALLOC  String needs memory allocated


// system variables

static void tokudb_lock_timeout_update(THD * thd, struct st_mysql_sys_var * sys_var, void * var, const void * save) {
    ulonglong *timeout = (ulonglong *) var;
    *timeout = *(const ulonglong *) save;
    db_env->set_lock_timeout(db_env, *timeout);
}

#define DEFAULT_LOCK_TIMEOUT_MSEC 4000

static MYSQL_SYSVAR_ULONGLONG(lock_timeout, tokudb_lock_timeout,
    0, "TokuDB lock timeout", 
    NULL, tokudb_lock_timeout_update, DEFAULT_LOCK_TIMEOUT_MSEC,
    0, ~0ULL, 0);

static void tokudb_cleaner_period_update(THD * thd, struct st_mysql_sys_var * sys_var, void * var, const void * save) {
    ulong * cleaner_period = (ulong *) var;
    *cleaner_period = *(const ulonglong *) save;
    int r = db_env->cleaner_set_period(db_env, *cleaner_period);
    assert(r == 0);
}

#define DEFAULT_CLEANER_PERIOD 1

static MYSQL_SYSVAR_ULONG(cleaner_period, tokudb_cleaner_period,
    0, "TokuDB cleaner_period", 
    NULL, tokudb_cleaner_period_update, DEFAULT_CLEANER_PERIOD,
    0, ~0UL, 0);

static void tokudb_cleaner_iterations_update(THD * thd, struct st_mysql_sys_var * sys_var, void * var, const void * save) {
    ulong * cleaner_iterations = (ulong *) var;
    *cleaner_iterations = *(const ulonglong *) save;
    int r = db_env->cleaner_set_iterations(db_env, *cleaner_iterations);
    assert(r == 0);
}

#define DEFAULT_CLEANER_ITERATIONS 5

static MYSQL_SYSVAR_ULONG(cleaner_iterations, tokudb_cleaner_iterations,
    0, "TokuDB cleaner_iterations", 
    NULL, tokudb_cleaner_iterations_update, DEFAULT_CLEANER_ITERATIONS,
    0, ~0UL, 0);

static void tokudb_checkpointing_period_update(THD * thd, struct st_mysql_sys_var * sys_var, void * var, const void * save) {
    uint * checkpointing_period = (uint *) var;
    *checkpointing_period = *(const ulonglong *) save;
    int r = db_env->checkpointing_set_period(db_env, *checkpointing_period);
    assert(r == 0);
}

static MYSQL_SYSVAR_UINT(checkpointing_period, tokudb_checkpointing_period, 
    0, "TokuDB Checkpointing period", 
    NULL, tokudb_checkpointing_period_update, 60, 
    0, ~0U, 0);

static MYSQL_SYSVAR_BOOL(directio, tokudb_directio,
    PLUGIN_VAR_READONLY,
    "TokuDB Enable Direct I/O ",
    NULL, NULL, FALSE);
static MYSQL_SYSVAR_BOOL(checkpoint_on_flush_logs, tokudb_checkpoint_on_flush_logs,
    0,
    "TokuDB Checkpoint on Flush Logs ",
    NULL, NULL, FALSE);

static MYSQL_SYSVAR_ULONGLONG(cache_size, tokudb_cache_size,
    PLUGIN_VAR_READONLY, "TokuDB cache table size", NULL, NULL, 0,
    0, ~0ULL, 0);

static MYSQL_SYSVAR_ULONGLONG(max_lock_memory, tokudb_max_lock_memory, PLUGIN_VAR_READONLY, "TokuDB max memory for locks", NULL, NULL, 0, 0, ~0ULL, 0);
static MYSQL_SYSVAR_ULONG(debug, tokudb_debug, 0, "TokuDB Debug", NULL, NULL, 0, 0, ~0UL, 0);

static MYSQL_SYSVAR_STR(log_dir, tokudb_log_dir, PLUGIN_VAR_READONLY, "TokuDB Log Directory", NULL, NULL, NULL);

static MYSQL_SYSVAR_STR(data_dir, tokudb_data_dir, PLUGIN_VAR_READONLY, "TokuDB Data Directory", NULL, NULL, NULL);

static MYSQL_SYSVAR_STR(version, tokudb_version, PLUGIN_VAR_READONLY, "TokuDB Version", NULL, NULL, NULL);

static MYSQL_SYSVAR_UINT(init_flags, tokudb_init_flags, PLUGIN_VAR_READONLY, "Sets TokuDB DB_ENV->open flags", NULL, NULL, tokudb_init_flags, 0, ~0U, 0);

static MYSQL_SYSVAR_UINT(write_status_frequency, tokudb_write_status_frequency, 0, "TokuDB frequency that show processlist updates status of writes", NULL, NULL, 1000, 0, ~0U, 0);
static MYSQL_SYSVAR_UINT(read_status_frequency, tokudb_read_status_frequency, 0, "TokuDB frequency that show processlist updates status of reads", NULL, NULL, 10000, 0, ~0U, 0);
static MYSQL_SYSVAR_INT(fs_reserve_percent, tokudb_fs_reserve_percent, PLUGIN_VAR_READONLY, "TokuDB file system space reserve (percent free required)", NULL, NULL, 5, 0, 100, 0);
static MYSQL_SYSVAR_STR(tmp_dir, tokudb_tmp_dir, PLUGIN_VAR_READONLY, "Tokudb Tmp Dir", NULL, NULL, NULL);

static void tokudb_fsync_log_period_update(THD *thd, struct st_mysql_sys_var *sys_var, void *var, const void *save) {
    uint32 *period = (uint32 *) var;
    *period = *(const ulonglong *) save;
    db_env->change_fsync_log_period(db_env, *period);
}

static MYSQL_SYSVAR_UINT(fsync_log_period, tokudb_fsync_log_period, 0, "TokuDB fsync log period", NULL, tokudb_fsync_log_period_update, 0, 0, ~0U, 0);

static struct st_mysql_sys_var *tokudb_system_variables[] = {
    MYSQL_SYSVAR(cache_size),
    MYSQL_SYSVAR(max_lock_memory),
    MYSQL_SYSVAR(data_dir),
    MYSQL_SYSVAR(log_dir),
    MYSQL_SYSVAR(debug),
    MYSQL_SYSVAR(commit_sync),
    MYSQL_SYSVAR(lock_timeout),
    MYSQL_SYSVAR(cleaner_period),
    MYSQL_SYSVAR(cleaner_iterations),
    MYSQL_SYSVAR(pk_insert_mode),
    MYSQL_SYSVAR(load_save_space),
    MYSQL_SYSVAR(disable_slow_alter),
    MYSQL_SYSVAR(disable_hot_alter),
    MYSQL_SYSVAR(create_index_online),
    MYSQL_SYSVAR(disable_prefetching),
    MYSQL_SYSVAR(version),
    MYSQL_SYSVAR(init_flags),
    MYSQL_SYSVAR(checkpointing_period),
    MYSQL_SYSVAR(prelock_empty),
    MYSQL_SYSVAR(log_client_errors),
    MYSQL_SYSVAR(checkpoint_lock),
    MYSQL_SYSVAR(write_status_frequency),
    MYSQL_SYSVAR(read_status_frequency),
    MYSQL_SYSVAR(fs_reserve_percent),
    MYSQL_SYSVAR(tmp_dir),
    MYSQL_SYSVAR(block_size),
    MYSQL_SYSVAR(read_block_size),
    MYSQL_SYSVAR(read_buf_size),
    MYSQL_SYSVAR(row_format),
    MYSQL_SYSVAR(directio),
    MYSQL_SYSVAR(checkpoint_on_flush_logs),
#if TOKU_INCLUDE_UPSERT
    MYSQL_SYSVAR(disable_slow_update),
    MYSQL_SYSVAR(disable_slow_upsert),
#endif
    MYSQL_SYSVAR(analyze_time),
    MYSQL_SYSVAR(fsync_log_period),
    NULL
};

struct st_mysql_storage_engine tokudb_storage_engine = { MYSQL_HANDLERTON_INTERFACE_VERSION };

static ST_FIELD_INFO tokudb_user_data_field_info[] = {
    {"database_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"table_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"data_size", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {NULL, 0, MYSQL_TYPE_NULL, 0, 0, NULL, SKIP_OPEN_TABLE}
};

#if MYSQL_VERSION_ID >= 50600
static int tokudb_user_data_fill_table(THD *thd, TABLE_LIST *tables, Item *cond) {
#else
static int tokudb_user_data_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) {
#endif
    int error;
    TABLE *table = tables->table;
    
    // 3938: Get a read lock on the status flag, since we must
    // read it before safely proceeding
    rw_rdlock(&tokudb_hton_initialized_lock);

    if (!tokudb_hton_initialized) {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), "TokuDB");
        error = -1;
    } else {
        error = tokudb_get_user_data_size(table, thd, false);
    }

    // 3938: unlock the status flag lock
    rw_unlock(&tokudb_hton_initialized_lock);
    return error;
}

static int tokudb_user_data_init(void *p) {
    ST_SCHEMA_TABLE *schema = (ST_SCHEMA_TABLE *) p;
    schema->fields_info = tokudb_user_data_field_info;
    schema->fill_table = tokudb_user_data_fill_table;
    return 0;
}

static int tokudb_user_data_done(void *p) {
    return 0;
}

static struct st_mysql_information_schema tokudb_user_data_information_schema = { MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };

static struct st_mysql_information_schema tokudb_fractal_tree_info_information_schema = { MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };

static struct st_mysql_information_schema tokudb_fractal_tree_block_map_information_schema = { MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };

static ST_FIELD_INFO tokudb_user_data_exact_field_info[] = {
    {"database_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"table_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"data_size", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {NULL, 0, MYSQL_TYPE_NULL, 0, 0, NULL, SKIP_OPEN_TABLE}
};

static ST_FIELD_INFO tokudb_dictionary_field_info[] = {
    {"dictionary_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"internal_file_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {NULL, 0, MYSQL_TYPE_NULL, 0, 0, NULL, SKIP_OPEN_TABLE}
};

static ST_FIELD_INFO tokudb_fractal_tree_info_field_info[] = {
    {"dictionary_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"internal_file_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"bt_num_blocks_allocated", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"bt_num_blocks_in_use", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"bt_size_allocated", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"bt_size_in_use", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {NULL, 0, MYSQL_TYPE_NULL, 0, 0, NULL, SKIP_OPEN_TABLE}
};

static ST_FIELD_INFO tokudb_fractal_tree_block_map_field_info[] = {
    {"dictionary_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"internal_file_name", 256, MYSQL_TYPE_STRING, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"checkpoint_count", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"blocknum", 0, MYSQL_TYPE_LONGLONG, 0, 0, NULL, SKIP_OPEN_TABLE },
    {"offset", 0, MYSQL_TYPE_LONGLONG, 0, MY_I_S_MAYBE_NULL, NULL, SKIP_OPEN_TABLE },
    {"size", 0, MYSQL_TYPE_LONGLONG, 0, MY_I_S_MAYBE_NULL, NULL, SKIP_OPEN_TABLE },
    {NULL, 0, MYSQL_TYPE_NULL, 0, 0, NULL, SKIP_OPEN_TABLE}
};


#if MYSQL_VERSION_ID >= 50600
static int tokudb_dictionary_info_fill_table(THD *thd, TABLE_LIST *tables, Item *cond) {
#else
static int tokudb_dictionary_info_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) {
#endif
    int error;
    TABLE *table = tables->table;

    // 3938: Get a read lock on the status flag, since we must
    // read it before safely proceeding
    rw_rdlock(&tokudb_hton_initialized_lock);

    if (!tokudb_hton_initialized) {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), "TokuDB");
        error = -1;
    } else {
        error = tokudb_dictionary_info(table, thd);
    }

    //3938: unlock the status flag lock
    rw_unlock(&tokudb_hton_initialized_lock);
    return error;
}

#if MYSQL_VERSION_ID >= 50600
static int tokudb_user_data_exact_fill_table(THD *thd, TABLE_LIST *tables, Item *cond) {
#else
static int tokudb_user_data_exact_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) {
#endif
    int error;
    TABLE *table = tables->table;

    // 3938: Get a read lock on the status flag, since we must
    // read it before safely proceeding
    rw_rdlock(&tokudb_hton_initialized_lock);

    if (!tokudb_hton_initialized) {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), "TokuDB");
        error = -1;
    } else {
        error = tokudb_get_user_data_size(table, thd, true);
    }

    //3938: unlock the status flag lock
    rw_unlock(&tokudb_hton_initialized_lock);
    return error;
}

#if MYSQL_VERSION_ID >= 50600
static int tokudb_fractal_tree_info_fill_table(THD *thd, TABLE_LIST *tables, Item *cond) {
#else
static int tokudb_fractal_tree_info_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) {
#endif
    int error;
    TABLE *table = tables->table;

    // 3938: Get a read lock on the status flag, since we must
    // read it before safely proceeding
    rw_rdlock(&tokudb_hton_initialized_lock);

    if (!tokudb_hton_initialized) {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), "TokuDB");
        error = -1;
    } else {
        error = tokudb_fractal_tree_info(table, thd);
    }

    //3938: unlock the status flag lock
    rw_unlock(&tokudb_hton_initialized_lock);
    return error;
}

#if MYSQL_VERSION_ID >= 50600
static int tokudb_fractal_tree_block_map_fill_table(THD *thd, TABLE_LIST *tables, Item *cond) {
#else
static int tokudb_fractal_tree_block_map_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) {
#endif
    int error;
    TABLE *table = tables->table;

    // 3938: Get a read lock on the status flag, since we must
    // read it before safely proceeding
    rw_rdlock(&tokudb_hton_initialized_lock);

    if (!tokudb_hton_initialized) {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), "TokuDB");
        error = -1;
    } else {
        error = tokudb_fractal_tree_block_map(table, thd);
    }

    //3938: unlock the status flag lock
    rw_unlock(&tokudb_hton_initialized_lock);
    return error;
}

static int tokudb_user_data_exact_init(void *p) {
    ST_SCHEMA_TABLE *schema = (ST_SCHEMA_TABLE *) p;
    schema->fields_info = tokudb_user_data_exact_field_info;
    schema->fill_table = tokudb_user_data_exact_fill_table;
    return 0;
}

static int tokudb_user_data_exact_done(void *p) {
    return 0;
}

static int tokudb_dictionary_info_init(void *p) {
    ST_SCHEMA_TABLE *schema = (ST_SCHEMA_TABLE *) p;
    schema->fields_info = tokudb_dictionary_field_info;
    schema->fill_table = tokudb_dictionary_info_fill_table;
    return 0;
}

static int tokudb_dictionary_info_done(void *p) {
    return 0;
}

static int tokudb_fractal_tree_info_init(void *p) {
    ST_SCHEMA_TABLE *schema = (ST_SCHEMA_TABLE *) p;
    schema->fields_info = tokudb_fractal_tree_info_field_info;
    schema->fill_table = tokudb_fractal_tree_info_fill_table;
    return 0;
}

static int tokudb_fractal_tree_info_done(void *p) {
    return 0;
}

static int tokudb_fractal_tree_block_map_init(void *p) {
    ST_SCHEMA_TABLE *schema = (ST_SCHEMA_TABLE *) p;
    schema->fields_info = tokudb_fractal_tree_block_map_field_info;
    schema->fill_table = tokudb_fractal_tree_block_map_fill_table;
    return 0;
}

static int tokudb_fractal_tree_block_map_done(void *p) {
    return 0;
}

static struct st_mysql_information_schema tokudb_user_data_exact_information_schema = { MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };

enum { TOKUDB_PLUGIN_VERSION = 0x0400 };
#define TOKUDB_PLUGIN_VERSION_STR "1024"

// Retrieves variables for information_schema.global_status.
// Names (columnname) are automatically converted to upper case, and prefixed with "TOKUDB_"
static int show_tokudb_vars(THD *thd, SHOW_VAR *var, char *buff) {
    TOKUDB_DBUG_ENTER("show_tokudb_vars");

    int error;
    uint64_t panic;
    const int panic_string_len = 1024;
    char panic_string[panic_string_len] = {'\0'};
    fs_redzone_state redzone_state;

    uint64_t num_rows;
    error = db_env->get_engine_status (db_env, toku_global_status_rows, toku_global_status_max_rows, &num_rows, &redzone_state, &panic, panic_string, panic_string_len, TOKU_GLOBAL_STATUS);
    //TODO: Maybe do something with the panic output?
#if 0
    if (strlen(panic_string)) {
        STATPRINT("Environment panic string", panic_string);
    }
#endif
    if (error == 0) {
        assert(num_rows <= toku_global_status_max_rows);
        //TODO: Maybe enable some of the items here: (copied from engine status
#if 0
        if (panic) {
            snprintf(buf, bufsiz, "%" PRIu64, panic);
            STATPRINT("Environment panic", buf);
        }

        if(redzone_state == FS_BLOCKED) {
            STATPRINT("*** URGENT WARNING ***", "FILE SYSTEM IS COMPLETELY FULL");
            snprintf(buf, bufsiz, "FILE SYSTEM IS COMPLETELY FULL");
        }
        else if (redzone_state == FS_GREEN) {
            snprintf(buf, bufsiz, "more than %d percent of total file system space", 2*tokudb_fs_reserve_percent);
        }
        else if (redzone_state == FS_YELLOW) {
            snprintf(buf, bufsiz, "*** WARNING *** FILE SYSTEM IS GETTING FULL (less than %d percent free)", 2*tokudb_fs_reserve_percent);
        }
        else if (redzone_state == FS_RED){
            snprintf(buf, bufsiz, "*** WARNING *** FILE SYSTEM IS GETTING VERY FULL (less than %d percent free): INSERTS ARE PROHIBITED", tokudb_fs_reserve_percent);
        }
        else {
            snprintf(buf, bufsiz, "information unavailable, unknown redzone state %d", redzone_state);
        }
        STATPRINT ("disk free space", buf);
#endif


        //TODO: (optionally) add redzone state, panic, panic string, etc. Right now it's being ignored.

        for (uint64_t row = 0; row < num_rows; row++) {
            SHOW_VAR &status_var = toku_global_status_variables[row];
            TOKU_ENGINE_STATUS_ROW_S &status_row = toku_global_status_rows[row];

            status_var.name = status_row.columnname;
            switch (status_row.type) {
            case FS_STATE:
            case UINT64:
                status_var.type = SHOW_LONGLONG;
                status_var.value = (char*)&status_row.value.num;
                break;
            case CHARSTR:
                status_var.type = SHOW_CHAR;
                status_var.value = (char*)status_row.value.str;
                break;
            case UNIXTIME:
                {
                    status_var.type = SHOW_CHAR;
                    time_t t = status_row.value.num;
                    char tbuf[26];
                    // Reuse the memory in status_row. (It belongs to us).
                    snprintf(status_row.value.datebuf, sizeof(status_row.value.datebuf), "%.24s", ctime_r(&t, tbuf));
                    status_var.value = (char*)&status_row.value.datebuf[0];
                }
                break;
            case TOKUTIME:
                {
                    status_var.type = SHOW_DOUBLE;
                    double t = tokutime_to_seconds(status_row.value.num);
                    // Reuse the memory in status_row. (It belongs to us).
                    status_row.value.dnum = t;
                    status_var.value = (char*)&status_row.value.dnum;
                }
                break;
            case PARCOUNT:
                {
                    status_var.type = SHOW_LONGLONG;
                    uint64_t v = read_partitioned_counter(status_row.value.parcount);
                    // Reuse the memory in status_row. (It belongs to us).
                    status_row.value.num = v;
                    status_var.value = (char*)&status_row.value.num;
                }
                break;
            default:
                {
                    status_var.type = SHOW_CHAR;
                    // Reuse the memory in status_row.datebuf. (It belongs to us).
                    // UNKNOWN TYPE: %d fits in 26 bytes (sizeof datebuf) for any integer.
                    snprintf(status_row.value.datebuf, sizeof(status_row.value.datebuf), "UNKNOWN TYPE: %d", status_row.type);
                    status_var.value = (char*)&status_row.value.datebuf[0];
                }
                break;
            }
        }
        // Sentinel value at end.
        toku_global_status_variables[num_rows].type = SHOW_LONG;
        toku_global_status_variables[num_rows].value = (char*)NullS;
        toku_global_status_variables[num_rows].name = (char*)NullS;

        var->type= SHOW_ARRAY;
        var->value= (char *) toku_global_status_variables;
    }
    if (error) { my_errno = error; }
    TOKUDB_DBUG_RETURN(error);
}

static SHOW_VAR toku_global_status_variables_export[]= {
    {"Tokudb", (char*)&show_tokudb_vars, SHOW_FUNC},
    {NullS, NullS, SHOW_LONG}
};

mysql_declare_plugin(tokudb) 
{
    MYSQL_STORAGE_ENGINE_PLUGIN, 
    &tokudb_storage_engine, 
    tokudb_hton_name, 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_init_func,          /* plugin init */
    tokudb_done_func,          /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    toku_global_status_variables_export,  /* status variables */
    tokudb_system_variables,   /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_information_schema, 
    "TokuDB_user_data", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_user_data_init,     /* plugin init */
    tokudb_user_data_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_exact_information_schema, 
    "TokuDB_user_data_exact", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_user_data_exact_init,     /* plugin init */
    tokudb_user_data_exact_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_exact_information_schema, 
    "TokuDB_file_map", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_dictionary_info_init,     /* plugin init */
    tokudb_dictionary_info_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_fractal_tree_info_information_schema, 
    "TokuDB_fractal_tree_info", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_fractal_tree_info_init,     /* plugin init */
    tokudb_fractal_tree_info_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_fractal_tree_block_map_information_schema, 
    "TokuDB_fractal_tree_block_map", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_fractal_tree_block_map_init,     /* plugin init */
    tokudb_fractal_tree_block_map_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    NULL,                      /* config options */
#if MYSQL_VERSION_ID >= 50521
    0,                         /* flags */
#endif
}
mysql_declare_plugin_end;

#ifdef MARIA_PLUGIN_INTERFACE_VERSION

maria_declare_plugin(tokudb) 
{
    MYSQL_STORAGE_ENGINE_PLUGIN, 
    &tokudb_storage_engine, 
    tokudb_hton_name, 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_init_func,          /* plugin init */
    tokudb_done_func,          /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    toku_global_status_variables_export,  /* status variables */
    tokudb_system_variables,   /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_information_schema, 
    "TokuDB_user_data", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_user_data_init,     /* plugin init */
    tokudb_user_data_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_exact_information_schema, 
    "TokuDB_user_data_exact", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_user_data_exact_init,     /* plugin init */
    tokudb_user_data_exact_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_user_data_exact_information_schema, 
    "TokuDB_file_map", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_dictionary_info_init,     /* plugin init */
    tokudb_dictionary_info_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_fractal_tree_info_information_schema, 
    "TokuDB_fractal_tree_info", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_fractal_tree_info_init,     /* plugin init */
    tokudb_fractal_tree_info_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
},
{
    MYSQL_INFORMATION_SCHEMA_PLUGIN, 
    &tokudb_fractal_tree_block_map_information_schema, 
    "TokuDB_fractal_tree_block_map", 
    "Tokutek Inc", 
    "Tokutek TokuDB Storage Engine with Fractal Tree(tm) Technology",
    PLUGIN_LICENSE_GPL,
    tokudb_fractal_tree_block_map_init,     /* plugin init */
    tokudb_fractal_tree_block_map_done,     /* plugin deinit */
    TOKUDB_PLUGIN_VERSION,     /* 4.0.0 */
    NULL,                      /* status variables */
    NULL,                      /* system variables */
    TOKUDB_PLUGIN_VERSION_STR, /* string version */
    MariaDB_PLUGIN_MATURITY_ALPHA /* maturity */
}
maria_declare_plugin_end;

#endif