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https://issues.apache.org/jira/browse/MAPREDUCE-2644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060233#comment-13060233
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Aaron T. Myers commented on MAPREDUCE-2644:
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Hey Josh, the usual thing done in the rest of the Hadoop code when providing a
default value for a config is to use the two-argument version of
{{Configuration.get(...)}} whose first argument is the config key and whose
second argument will be returned as the value if no value for that key is set
in the conf object.
> NodeManager fails to create containers when NM_LOG_DIR is not explicitly set
> in the Configuration
> -------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2644
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2644
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Reporter: Josh Wills
> Assignee: Josh Wills
> Attachments: MAPREDUCE-2644.patch
>
>
> If the yarn configuration does not explicitly specify a value for the
> yarn.server.nodemanager.log.dir property, container allocation will fail on
> the NodeManager w/an NPE when the LocalDirAllocator goes to create the temp
> directory. In most of the code, we handle this by defaulting to /tmp/logs,
> but we cannot do this in the LocalDirAllocator context, so we need to set the
> default value explicitly in the Configuration.
> Marking this as major b/c it's annoying to bump into it when you're getting
> your first MRv2 cluster up and running. :)
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