hbase rpc should send size of response
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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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