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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4302) NM goes down if error encountered during log aggregation
Date Fri, 01 Jun 2012 16:59:23 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Daryn Sharp updated MAPREDUCE-4302:

    Attachment: MAPREDUCE-4302.patch

Wrap log aggregation init with a try block.  The log init is executed just before localization
starts instead of in parallel.  Log init sends back an app finish event on failure, or a log
init success after which localization begins.

Log init is serialized because it only makes a few directories and spins off a thread.  If
log init fails then the job itself is likely to fail, so a log init failure reports a diagnostic
of the exception back to the AM.  Otherwise if/when the job fails there will be no logs to
> NM goes down if error encountered during log aggregation
> --------------------------------------------------------
>                 Key: MAPREDUCE-4302
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4302
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 0.23.0, 2.0.0-alpha, trunk
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: MAPREDUCE-4302.patch
> When a container launch request is sent to the NM, if _any_ exception occurs during the
init of log aggregation then the NM goes down.  The problem can be induced by situations including,
but certainly not limited to: transient rpc connection issues, missing tokens, expired tokens,
permissions, full/quota exceeded dfs, etc.  The problem may occur with and without security
> The ramification is an entire cluster can be rather easily brought down either maliciously,
accidentally, or via a submission bug.

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