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https://issues.apache.org/jira/browse/HBASE-15544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215019#comment-15215019
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Vladimir Rodionov commented on HBASE-15544:
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Reuse them if cache-on-read is disabled (including compaction case).
> 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
>
>
> This accounts for 25% of memory allocation during compaction when compression
> is enabled.
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