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From: "Bikas Saha (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (YARN-3025) Provide API for retrieving
 blacklisted nodes
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    [ https://issues.apache.org/jira/browse/YARN-3025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291522#comment-14291522 ] 

Bikas Saha commented on YARN-3025:
----------------------------------

In the worst case, the frequency of this update can be once per heartbeat per AM. That can be high. Lets say 1000 AMs pinging every 1 sec.

> Provide API for retrieving blacklisted nodes
> --------------------------------------------
>
>                 Key: YARN-3025
>                 URL: https://issues.apache.org/jira/browse/YARN-3025
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Ted Yu
>
> We have the following method which updates blacklist:
> {code}
>   public synchronized void updateBlacklist(List<String> blacklistAdditions,
>       List<String> blacklistRemovals) {
> {code}
> Upon AM failover, there should be an API which returns the blacklisted nodes so that the new AM can make consistent decisions.
> The new API can be:
> {code}
>   public synchronized List<String> getBlacklistedNodes()
> {code}



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