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Committer:
David Pursehouse
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Author(s):
Dave Borowitz
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Date:
2018-02-22 07:27:09 UTC
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Revision ID:
git-v1:879372eb72d8b8a073f4f73d98caa1cd15971bd5
DfsReaderIoStats: Clarify that "blocks" are really cache misses
The previous wording was ambiguous as to whether these were blocks
requested from the cache (hits + misses) or read from underlying storage
(misses only).
They are in fact recording only misses:
Accumulator#{readBlock,readBlockBytes,readBlockMicros} are only
incremented from BlockBasedFile#readOneBlock, which is only called from
the cache miss path in DfsBlockCache#getOrLoad (line 391).
Change-Id: I0135cd1e76d09c1e28e0f1833b34c312511c66ce