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https://issues.apache.org/jira/browse/HDFS-13393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Bota reassigned HDFS-13393:
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Assignee: (was: Gabor Bota)
> Improve OOM logging
> -------------------
>
> Key: HDFS-13393
> URL: https://issues.apache.org/jira/browse/HDFS-13393
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover, datanode
> Reporter: Wei-Chiu Chuang
> Priority: Major
>
> It is not uncommon to find "java.lang.OutOfMemoryError: unable to create new
> native thread" errors in a HDFS cluster. Most often this happens when
> DataNode creating DataXceiver threads, or when balancer creates threads for
> moving blocks around.
> In most of cases, the "OOM" is a symptom of number of threads reaching system
> limit, rather than actually running out of memory, and the current logging of
> this message is usually misleading (suggesting this is due to insufficient
> memory)
> How about capturing the OOM, and if it is due to "unable to create new native
> thread", print some more helpful message like "bump your ulimit" or "take a
> jstack of the process"?
> Even better, surface this error to make it more visible. It usually takes a
> while for an in-depth investigation after users notice some job fails, by the
> time the evidences may already been gone (like jstack output).
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