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https://issues.apache.org/jira/browse/HBASE-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13130416#comment-13130416
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Jonathan Gray commented on HBASE-3581:
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should rename method to getErrorOrLengthSet()?
> hbase rpc should send size of response
> --------------------------------------
>
> Key: HBASE-3581
> URL: https://issues.apache.org/jira/browse/HBASE-3581
> Project: HBase
> Issue Type: Improvement
> Reporter: ryan rawson
> Assignee: stack
> Priority: Critical
> Fix For: 0.92.0
>
> Attachments: 3581-v2.txt, 3581-v3.txt, 3581-v4.txt,
> HBASE-rpc-response.txt
>
>
> The RPC reply from Server->Client does not include the size of the payload,
> it is framed like so:
> <i32> callId
> <byte> errorFlag
> <byte[]> data
> The data segment would contain enough info about how big the response is so
> that it could be decoded by a writable reader.
> This makes it difficult to write buffering clients, who might read the entire
> 'data' then pass it to a decoder. While less memory efficient, if you want to
> easily write block read clients (eg: nio) it would be necessary to send the
> size along so that the client could snarf into a local buf.
> The new proposal is:
> <i32> callId
> <i32> size
> <byte> errorFlag
> <byte[]> data
> the size being sizeof(data) + sizeof(errorFlag).
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