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Posted to common-issues@hadoop.apache.org by "Hemanth Yamijala (JIRA)" <ji...@apache.org> on 2012/09/05 07:12:07 UTC
[jira] [Commented] (HADOOP-8765) LocalDirAllocator.ifExists API is
broken and unused
[ 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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