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https://issues.apache.org/jira/browse/HBASE-15509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217451#comment-15217451
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Vladimir Rodionov commented on HBASE-15509:
-------------------------------------------

{quote}
Any perf numbers? Any GC graphs? We do better with patch?
{quote}

We do better with patch. We reduced garbage allocation by 20-30% in compaction 
and memstore flush threads. These are the only numbers I care about.

> 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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