Sunil G commented on YARN-2005:

Hi [~adhoot]
Thank you for sharing patch for same. I have couple of doubts.

Now default is 0.8, I feel we can keep this as a configurable limit. Based on 
node size, i feel user can decide till which threshold we can support AM 

- Below code from CS#allocate
   application.updateBlacklist(blacklistAdditions, blacklistRemovals);
Assume a case where app1 AM is running in {{node1}}. Due to a failure there, 
app is relaunched in {{node2}} and {{node1}} is marked for blacklisting by 
Since  node1 is added as blacklisted, all containers of this app will be 
blacklisted in node1. Is this intended, Please correct me if I am wrong.

> Blacklisting support for scheduling AMs
> ---------------------------------------
>                 Key: YARN-2005
>                 URL: https://issues.apache.org/jira/browse/YARN-2005
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 0.23.10, 2.4.0
>            Reporter: Jason Lowe
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-2005.001.patch, YARN-2005.002.patch, 
> YARN-2005.003.patch
> It would be nice if the RM supported blacklisting a node for an AM launch 
> after the same node fails a configurable number of AM attempts.  This would 
> be similar to the blacklisting support for scheduling task attempts in the 
> MapReduce AM but for scheduling AM attempts on the RM side.

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