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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3581) hbase rpc should send size of response
Date Fri, 21 Oct 2011 10:06:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132567#comment-13132567
] 

Hudson commented on HBASE-3581:
-------------------------------

Integrated in HBase-0.92 #75 (See [https://builds.apache.org/job/HBase-0.92/75/])
    HBASE-4620 I broke the build when I submitted HBASE-3581 (Send length of the rpc response)

stack : 
Files : 
* /hbase/branches/0.92/CHANGES.txt
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/ipc/ResponseFlag.java

                
> 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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