[ 
https://issues.apache.org/jira/browse/YARN-4270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964478#comment-14964478
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Hudson commented on YARN-4270:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #571 (See 
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/571/])
YARN-4270. Limit application resource reservation on nodes for (arun suresh: 
rev 7e2837f830382835838c82398db6fc9823d612a7)
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairScheduler.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerConfiguration.java


> Limit application resource reservation on nodes for non-node/rack specific 
> requests
> -----------------------------------------------------------------------------------
>
>                 Key: YARN-4270
>                 URL: https://issues.apache.org/jira/browse/YARN-4270
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>             Fix For: 2.8.0
>
>         Attachments: YARN-4270.1.patch, YARN-4270.2.patch, YARN-4270.3.patch, 
> YARN-4270.4.patch, YARN-4270.5.patch
>
>
> I has been noticed that for off-switch requests, the FairScheduler reserves 
> resources on all nodes. This could lead to the entire cluster being 
> unavailable for all other applications.
> Ideally, the reservations should be on a configurable number of nodes, 
> default 1.



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