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package org.apache.lucene.index;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.store.MockDirectoryWrapper;
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import org.apache.lucene.analysis.MockAnalyzer;
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import org.apache.lucene.document.Document;
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import org.apache.lucene.document.Field;
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import org.apache.lucene.index.IndexWriterConfig.OpenMode;
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import org.apache.lucene.util.LuceneTestCase;
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import java.io.IOException;
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public class TestConcurrentMergeScheduler extends LuceneTestCase {
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private static class FailOnlyOnFlush extends MockDirectoryWrapper.Failure {
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public void setDoFail() {
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public void clearDoFail() {
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public void eval(MockDirectoryWrapper dir) throws IOException {
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if (doFail && (Thread.currentThread().getName().equals("main")
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|| Thread.currentThread().getName().equals("Main Thread"))) {
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boolean isDoFlush = false;
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boolean isClose = false;
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StackTraceElement[] trace = new Exception().getStackTrace();
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for (int i = 0; i < trace.length; i++) {
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if ("doFlush".equals(trace[i].getMethodName())) {
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if ("close".equals(trace[i].getMethodName())) {
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if (isDoFlush && !isClose && random.nextBoolean()) {
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throw new IOException(Thread.currentThread().getName() + ": now failing during flush");
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// Make sure running BG merges still work fine even when
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// we are hitting exceptions during flushing.
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public void testFlushExceptions() throws IOException {
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MockDirectoryWrapper directory = newDirectory();
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FailOnlyOnFlush failure = new FailOnlyOnFlush();
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directory.failOn(failure);
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IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMaxBufferedDocs(2));
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writer.setInfoStream(VERBOSE ? System.out : null);
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Document doc = new Document();
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Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
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for(int i=0;i<10;i++) {
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System.out.println("TEST: iter=" + i);
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for(int j=0;j<20;j++) {
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idField.setValue(Integer.toString(i*20+j));
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writer.addDocument(doc);
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// must cycle here because sometimes the merge flushes
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// the doc we just added and so there's nothing to
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// flush, and we don't hit the exception
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writer.addDocument(doc);
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writer.flush(true, true);
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if (failure.hitExc) {
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fail("failed to hit IOException");
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} catch (IOException ioe) {
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ioe.printStackTrace(System.out);
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failure.clearDoFail();
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assertEquals(20*(i+1)+extraCount, writer.numDocs());
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IndexReader reader = IndexReader.open(directory, true);
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assertEquals(200+extraCount, reader.numDocs());
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// Test that deletes committed after a merge started and
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// before it finishes, are correctly merged back:
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public void testDeleteMerging() throws IOException {
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MockDirectoryWrapper directory = newDirectory();
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LogDocMergePolicy mp = new LogDocMergePolicy();
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// Force degenerate merging so we can get a mix of
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// merging of segments with and without deletes at the
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mp.setMinMergeDocs(1000);
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IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(
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TEST_VERSION_CURRENT, new MockAnalyzer(random))
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.setMergePolicy(mp));
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writer.setInfoStream(VERBOSE ? System.out : null);
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Document doc = new Document();
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Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
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for(int i=0;i<10;i++) {
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System.out.println("\nTEST: cycle");
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for(int j=0;j<100;j++) {
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idField.setValue(Integer.toString(i*100+j));
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writer.addDocument(doc);
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while(delID < 100*(1+i)) {
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System.out.println("TEST: del " + delID);
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writer.deleteDocuments(new Term("id", ""+delID));
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IndexReader reader = IndexReader.open(directory, true);
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// Verify that we did not lose any deletes...
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assertEquals(450, reader.numDocs());
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public void testNoExtraFiles() throws IOException {
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MockDirectoryWrapper directory = newDirectory();
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IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(
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TEST_VERSION_CURRENT, new MockAnalyzer(random))
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.setMaxBufferedDocs(2));
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writer.setInfoStream(VERBOSE ? System.out : null);
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for(int iter=0;iter<7;iter++) {
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System.out.println("TEST: iter=" + iter);
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for(int j=0;j<21;j++) {
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Document doc = new Document();
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doc.add(newField("content", "a b c", Field.Store.NO, Field.Index.ANALYZED));
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writer.addDocument(doc);
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TestIndexWriter.assertNoUnreferencedFiles(directory, "testNoExtraFiles");
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writer = new IndexWriter(directory, newIndexWriterConfig(
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TEST_VERSION_CURRENT, new MockAnalyzer(random))
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.setOpenMode(OpenMode.APPEND).setMaxBufferedDocs(2));
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writer.setInfoStream(VERBOSE ? System.out : null);
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public void testNoWaitClose() throws IOException {
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MockDirectoryWrapper directory = newDirectory();
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Document doc = new Document();
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Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
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IndexWriter writer = new IndexWriter(
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newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
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setMaxBufferedDocs(2).
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setMergePolicy(newLogMergePolicy(100))
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for(int iter=0;iter<10;iter++) {
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for(int j=0;j<201;j++) {
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idField.setValue(Integer.toString(iter*201+j));
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writer.addDocument(doc);
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int delID = iter*201;
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for(int j=0;j<20;j++) {
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writer.deleteDocuments(new Term("id", Integer.toString(delID)));
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// Force a bunch of merge threads to kick off so we
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// stress out aborting them on close:
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((LogMergePolicy) writer.getConfig().getMergePolicy()).setMergeFactor(3);
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writer.addDocument(doc);
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IndexReader reader = IndexReader.open(directory, true);
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assertEquals((1+iter)*182, reader.numDocs());
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writer = new IndexWriter(
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newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
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setOpenMode(OpenMode.APPEND).
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setMergePolicy(newLogMergePolicy(100))