[jira] [Updated] (HBASE-3581) hbase rpc should send size of response

["Ted Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu updated HBASE-3581:
--------------------------

    Fix Version/s:     (was: 0.92.0)
                   0.94.0

Moving to 0.94 for now.

> 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: ryan rawson
>            Priority: Critical
>             Fix For: 0.94.0
>
>         Attachments: 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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