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https://issues.apache.org/jira/browse/YARN-1773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Varun Saxena updated YARN-1773:
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Assignee: (was: Varun Saxena)
> 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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