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https://issues.apache.org/jira/browse/SPARK-16630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428721#comment-16428721
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Attila Zsolt Piros commented on SPARK-16630:
--------------------------------------------

Yes you are right more executors can be allocated on the same host. I have 
checked and using getNumClusterNodes is not as hard so I will do that. 

> Blacklist a node if executors won't launch on it.
> -------------------------------------------------
>
>                 Key: SPARK-16630
>                 URL: https://issues.apache.org/jira/browse/SPARK-16630
>             Project: Spark
>          Issue Type: Improvement
>          Components: YARN
>    Affects Versions: 1.6.2
>            Reporter: Thomas Graves
>            Priority: Major
>
> On YARN, its possible that a node is messed or misconfigured such that a 
> container won't launch on it.  For instance if the Spark external shuffle 
> handler didn't get loaded on it , maybe its just some other hardware issue or 
> hadoop configuration issue. 
> It would be nice we could recognize this happening and stop trying to launch 
> executors on it since that could end up causing us to hit our max number of 
> executor failures and then kill the job.



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