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https://issues.apache.org/jira/browse/HADOOP-8765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448487#comment-13448487
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Hemanth Yamijala commented on HADOOP-8765:
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BTW, all other calls to LocalDirAllocator first call
AllocatorPerContext.confChanged, that is responsible for initialising the
localDirsPath. Inserting that call fixes the NullPointerException.
> LocalDirAllocator.ifExists API is broken and unused
> ---------------------------------------------------
>
> Key: HADOOP-8765
> URL: https://issues.apache.org/jira/browse/HADOOP-8765
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Reporter: Hemanth Yamijala
> Assignee: Hemanth Yamijala
> Priority: Minor
>
> LocalDirAllocator.ifExists calls AllocatorPerContext.ifExists, which accesses
> the localDirsPath variable that is uninitialised. Hence, any code that uses
> this API is likely to fail with a NullPointerException.
> However, this API is currently not used anywhere else in trunk. The earlier
> usage was in IsolationRunner, that has since been removed via MAPREDUCE-2606.
> Hence, we could remove this API for trunk, and if required, fix it for the
> 1.x branch.
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