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https://issues.apache.org/jira/browse/YARN-6432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976037#comment-15976037
 ] 

John Zhuge commented on YARN-6432:
----------------------------------

No problem [[email protected]].

In the addendum patch, you probably should use the following code as specified 
by by [Map#putIfAbsent JDK8 
doc|https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#putIfAbsent-K-V-]
bq. If the specified key is not already associated with a value (or is mapped 
to null)..."
{code}
  if (get(key) == null) {
    put(key, value);
  }
{code}

You can see [my patch posted to 
YARN-6501|https://issues.apache.org/jira/secure/attachment/12864183/YARN-6501.branch-2.001.patch].

> FairScheduler: Reserve preempted resources for corresponding applications
> -------------------------------------------------------------------------
>
>                 Key: YARN-6432
>                 URL: https://issues.apache.org/jira/browse/YARN-6432
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Miklos Szegedi
>            Assignee: Miklos Szegedi
>             Fix For: 2.9.0, 3.0.0-alpha3
>
>         Attachments: YARN-6432.000.patch, YARN-6432.001.patch, 
> YARN-6432.002.patch, YARN-6432.branch-2.addendum.patch, 
> YARN-6432.branch-2.patch
>
>




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