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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-1773) ShuffleHeader should have a format that can inform about errors
Date Wed, 15 Jun 2016 04:24:09 GMT

    [ https://issues.apache.org/jira/browse/YARN-1773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329895#comment-15329895
] 

Varun Saxena edited comment on YARN-1773 at 6/15/16 4:23 AM:
-------------------------------------------------------------

[~djp], sorry this fell off my radar.
Do not have bandwidth to fix it, in short term.

I have unassigned it in case somebody else wants to take it up. Will assign it back to myself
once I have bandwidth and if nobody else has taken it up.


was (Author: varun_saxena):
[~djp], sorry this fell off my radar.
Do not have bandwidth to fix it, in short term. You can take it up, if you want.

> ShuffleHeader should have a format that can inform about errors
> ---------------------------------------------------------------
>
>                 Key: YARN-1773
>                 URL: https://issues.apache.org/jira/browse/YARN-1773
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.3.0, 2.4.0
>            Reporter: Bikas Saha
>            Priority: Critical
>
> Currently, the ShuffleHeader (which is a Writable) simply tries to read the successful
header (mapid, reduceid etc). If there is an error then the input will have an error message
instead of (mapid, reducedid etc). Thus parsing the ShuffleHeader fails and since we dont
know where the error message ends, we cannot consume the remaining input stream which may
have good data from the remaining map outputs. Being able to encode the error in the ShuffleHeader
will let us parse out the error correctly and move on to the remaining data.
> The shuffle handler response should say which maps are in error and which are fine, what
the error was for the erroneous maps. These will help report diagnostics for easier upstream
reporting.



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