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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3581) hbase rpc should send size of response
Date Mon, 28 Feb 2011 21:08:37 GMT
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
             Fix For: 0.92.0

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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