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https://issues.apache.org/jira/browse/HBASE-16650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15502488#comment-15502488
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Anoop Sam John commented on HBASE-16650:
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Ping for reviews [~stack], [~ram_krish]
> Wrong usage of BlockCache eviction stat for heap memory tuning
> --------------------------------------------------------------
>
> Key: HBASE-16650
> URL: https://issues.apache.org/jira/browse/HBASE-16650
> Project: HBase
> Issue Type: Sub-task
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-16650.patch
>
>
> 1. We use the stat evictedBlocksCount - A block can get evicted because of
> eviction thread due to lack of space or because of removal of an HFile itself
> (After a compaction). We should not consider the latter in the tune decision
> at all. These are actually invalidation of blocks. Should the stat counter
> itself not use this count of evicted blocks? I think yes. This will give
> wrong message to users that there are lot of real eviction happening.
> 2. In case L1+ L2 combined block cache, what we use is the sum of evictions
> from both. But we will be tuning L1 size alone. Eviction count from L2 should
> not affect the tuning of L1
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