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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9151) Include RPC error info in RpcResponseHeader instead of sending it separately
Date Fri, 04 Jan 2013 06:46:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543642#comment-13543642

Todd Lipcon commented on HADOOP-9151:

Hi Sanjay. I mentioned CDH out of transparency, but I think it's beneficial for Hadoop 2.0.x
and 2.1.x to remain wire-compatible with 2.0.2 and earlier, if possible. Even outside of CDH,
people are using 2.0.x, and we should try to make their lives easier, unless we have a substantial
reasoning to break compatibility.

As for your question: no, you'd need a client side change in order to be able to interpret
the earlier version responses. Certainly we could make a change in CDH which would allow the
next version of CDH to be compatible both with Hadoop 2.0.3+ clients and also 2.0.2 (by switching
on the IPC version that the client connects with). But, as a community contributor, I think
we should strive to maintain wire compatibility between Apache Hadoop versions unless we've
got a good reason to break it, vendor distributions aside.
> Include RPC error info in RpcResponseHeader instead of sending it separately
> ----------------------------------------------------------------------------
>                 Key: HADOOP-9151
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9151
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: HADOOP-9151.patch

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