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https://issues.apache.org/jira/browse/HBASE-15509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217460#comment-15217460
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Vladimir Rodionov commented on HBASE-15509:
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This patch + 4 more in HBASE-15542 will allow us, potentially, reduce memory
allocation during compaction by more than 90% (10x times). That, in turn,
will allow us to run compactions more aggressively, without throughput
controller and with 5-10 threads in parallel. This is the eventual goal.
> Avoid copy of block data in HFileBlock$Writer.finishBlock
> ---------------------------------------------------------
>
> Key: HBASE-15509
> URL: https://issues.apache.org/jira/browse/HBASE-15509
> Project: HBase
> Issue Type: Sub-task
> Components: HFile
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Attachments: HBASE-15509-v1.patch, HBASE-15509-v2.patch
>
>
> This calls ByteArrayOutputStream.toByteArray() which creates a copy of data
> block.
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