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https://issues.apache.org/jira/browse/HBASE-15509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15205778#comment-15205778
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stack commented on HBASE-15509:
-------------------------------
It says in code:
// This does an array copy, so it is safe to cache this byte array when
cache-on-write.
// Header is still the empty, 'dummy' header that is yet to be filled out.
So perhaps, if we are not doing cache-on-write, we don't need to allocate at
all?
Could try putting in place the BoundedByteBufferPool here? Could then easily
have the pool be offheap.
> 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: Improvement
> Components: HFile
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
>
> This calls ByteArrayOutputStream.toByteArray() which creates a copy of data
> block.
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