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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (YARN-1799) Enhance LocalDirAllocator in NM to consider DiskMaxUtilization cutoff
Date Fri, 16 May 2014 11:24:31 GMT

     [ https://issues.apache.org/jira/browse/YARN-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sunil G reassigned YARN-1799:
-----------------------------

    Assignee: Sunil G

> Enhance LocalDirAllocator in NM to consider DiskMaxUtilization cutoff
> ---------------------------------------------------------------------
>
>                 Key: YARN-1799
>                 URL: https://issues.apache.org/jira/browse/YARN-1799
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 2.3.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>
> LocalDirAllocator provides paths for all tasks for its local write.
> This considers the good list of directories which are selected by the HealthCheck mechamnism
in LocalDirsHandlerService
> getLocalPathForWrite() considers whether input demand "size" can meet the "capacity"
in "lastAccessed" directory.
> If more tasks asks for path from LocalDirAllocator, then it is possible that the allocation
is done based on the current disk availability at that given time.
> But this path would have earlier given to some other tasks to write and they may be sequentially
doing writing.
> It is better to check for an upper cutoff for disk availability



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