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https://issues.apache.org/jira/browse/HBASE-15509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217453#comment-15217453
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Vladimir Rodionov commented on HBASE-15509:
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{quote}
Why have you selected a thread local? For a given writer the fsBlockWriter is
just one instance and when during flush/compaction we could use the same
fsBlockWriter only. So can we try to solve this without ThreadLocal?
{quote}
Let me think about this :)
> 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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