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https://issues.apache.org/jira/browse/HBASE-15544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15247168#comment-15247168
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Anoop Sam John commented on HBASE-15544:
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So this will keep buffers in pool permanently. What will be max size of all 
such buffers?  Running it for a long time do you see improvement wrt collective 
GC pause time and perf?

> HFileReaderImpl.readBlock allocates memory for HFileBlock on every call
> -----------------------------------------------------------------------
>
>                 Key: HBASE-15544
>                 URL: https://issues.apache.org/jira/browse/HBASE-15544
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15544-v1.patch, HBASE-15544-v2.patch
>
>
> This accounts for 25% of memory allocation during compaction when compression 
> is enabled.



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