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Date: Wed, 5 Sep 2012 16:12:07 +1100 (NCT)
From: "Hemanth Yamijala (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8765) LocalDirAllocator.ifExists API is
 broken and unused
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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 ] 

Hemanth Yamijala commented on HADOOP-8765:
------------------------------------------

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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