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https://issues.apache.org/jira/browse/MAPREDUCE-5694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mohammad Kamrul Islam updated MAPREDUCE-5694:
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Status: Open (was: Patch Available)
> MR AM container syslog is empty
> ---------------------------------
>
> Key: MAPREDUCE-5694
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5694
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Mohammad Kamrul Islam
> Assignee: Mohammad Kamrul Islam
> Attachments: MAPREDUCE-5694.1.patch
>
>
> When the property "mapreduce.task.userlog.limit.kb" is set non-zero in
> mapped-site.xml, AM container syslog remains empty. Without the log, it is
> hard to identify the cause of any MR AM failure.
> However, if "mapreduce.task.userlog.limit.kb" is not set (or defaulted to
> 0), syslog contents are correct.
>
> Bug details:
> For non zero "mapreduce.task.userlog.limit.kb", the code caches the log
> contents into memory, waited to be written to file when close() method is
> called at the end(Ref: ContainerLogAppender.java).
> Explicit call of LogManager.shutdown() from the main()
> (REF:MRAppMaster.java), ultimately call the *Appender.close().
> Root Cause:
> LogManager.shutdown() is not being called from MRAppMaster.java.
> Similar steps were taken correctly in YarnChild.java.
>
>
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