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http://issues.apache.org/jira/browse/HADOOP-27?page=comments#action_12365610 ] 

Bryan Pendleton commented on HADOOP-27:
---------------------------------------

Just to add specifics: since a task processor might've already completed 
previous tasks - when it runs out of space, it shouldn't be allocated new jobs, 
but it should stay available for serving map output to reduce jobs that need 
the completed output. Likewise, once such tasks have been cleared, and more 
space is available, the task runner should return to available status 
automatically.

> MapRed tries to allocate tasks to nodes that have no available disk space
> -------------------------------------------------------------------------
>
>          Key: HADOOP-27
>          URL: http://issues.apache.org/jira/browse/HADOOP-27
>      Project: Hadoop
>         Type: Bug
>   Components: mapred
>     Reporter: Mike Cafarella

>
>   What it says above.  MapRed TaskTrackers should not offer task service if 
> the local disk
> space is too constrained.

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