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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 Sat, 22 Dec 2012 18:59:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538879#comment-13538879

Todd Lipcon commented on HADOOP-9151:

bq. Also, it isn't true that the discussion was limited to YARN, see the link I posted above
w.r.t HDFS from Suresh: http://s.apache.org/qQp. I'm pretty sure you've ascribed to above
views too (w.r.t changing wire-protocols on HDFS etc.) - here is your own view that HDFS protocols
aren't 'baked' yet: http://s.apache.org/PRh

Two things about my post there -- for one, it was 8 months ago. More people have adopted 2.0
since then, and I think wire compatibility grows more important as more people adopt the system.
Second, I did say "+1 to locking down client wire protocol compatibility". This proposed patch
would break client compatibility.

bq. However, we might have to do more changes of this nature in the future (maybe major bugs
or new features etc. before hadoop-2 hits 'stable') and I really hope you won't be vetoing
further development on grounds of 'CDH compatibility'.

For any given issue, I would like to weigh three aspects against each other: 1) how much effort
would it be to do compatibly? 2) how painful will the change be for users who have already
deployed 2.x, whether via CDH, HDP2, or Apache), and 3) how much value is in the change. If
someone finds a big performance improvement or a security bug, and it's difficult to fix it
in a compatible way, I'm not going to veto it. But if it's just 'cleanup' with no advantage
to users, then I'm of the opinion that the negatives are stronger than the positives.

> 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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