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https://issues.apache.org/jira/browse/HBASE-4466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-4466.
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> Fix accounting of the number of blocks read for the one-level index case
> ------------------------------------------------------------------------
>
> Key: HBASE-4466
> URL: https://issues.apache.org/jira/browse/HBASE-4466
> Project: HBase
> Issue Type: Improvement
> Reporter: Kannan Muthukkaruppan
> Assignee: Mikhail Gryzykhin
> Priority: Major
>
> In HFileBlockIndex.seekToDataBlock if the current block is the same as the
> requested block, then in the 1-level index case, we were read block from
> cache again. Although this would be a cache hit, it unnecessarily increases
> the block cache read count and block cache hit count, and also makes it
> harder to keep the accounting straight for tests like TestBlocksRead
> (introduced in HBASE-4450).
> Basically, even in the 1-level index case, in
> HFileBlockIndex.seekToDataBlock(), if currentBlock.getOffset() ==
> currentOffset, we can avoid looking up the block in cache.
> Assigning to Mikhail (he's already fixed this in our internal branch).
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