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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16783) Use ByteBufferPool for the header and message during Rpc response
Date Wed, 12 Oct 2016 13:19:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568685#comment-15568685

ramkrishna.s.vasudevan commented on HBASE-16783:

Everything said above can be donenow but am stuck in one place that 
      byte[] b = new byte[headerSerializedSize + headerVintSize + resultSerializedSize
          + resultVintSize + Bytes.SIZEOF_INT];
Now here we could know all the other sizes except 'headerSerializedSize '. The only problem
is that 'headerSerializedSize' is the value that is found after cellBlockMeta size is added.

This could range anywhere between 4 and 8. So this is where am not sure how to limit the headerBuffer
to this size. If we always allocate 8 bytes for the headerSerializedSize then it could be
problem. (it takes 8 bytes when we have cellblockMeta size == Integer.max_value. Not possible
practically but still we need to support? Or am i missing something?). 

> Use ByteBufferPool for the header and message during Rpc response
> -----------------------------------------------------------------
>                 Key: HBASE-16783
>                 URL: https://issues.apache.org/jira/browse/HBASE-16783
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>         Attachments: HBASE-16783.patch, HBASE-16783_1.patch
> With ByteBufferPool in place we could avoid the byte[] creation in RpcServer#createHeaderAndMessageBytes
and try using the Buffer from the pool rather than creating byte[] every time.

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