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https://issues.apache.org/jira/browse/YARN-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14490943#comment-14490943
 ] 

Hudson commented on YARN-3469:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #2092 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2092/])
YARN-3469. ZKRMStateStore: Avoid setting watches that are not required. (Jun 
Hong via kasha) (kasha: rev e516706b896743e47e2852be81944eb5613e3e76)
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/ZKRMStateStore.java
* hadoop-yarn-project/CHANGES.txt


> ZKRMStateStore: Avoid setting watches that are not required
> -----------------------------------------------------------
>
>                 Key: YARN-3469
>                 URL: https://issues.apache.org/jira/browse/YARN-3469
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>            Priority: Minor
>             Fix For: 2.8.0
>
>         Attachments: YARN-3469.01.patch
>
>
> In ZKRMStateStore, most operations(e.g. getDataWithRetries, 
> getDataWithRetries, getDataWithRetries) set watches on znode. Large watches 
> will cause problem such as [ZOOKEEPER-706: large numbers of watches can cause 
> session re-establishment to 
> fail|https://issues.apache.org/jira/browse/ZOOKEEPER-706].  
> Although there is a workaround that setting jute.maxbuffer to a larger value, 
> we need to adjust this value once there are more app and attempts stored in 
> ZK. And those watches are useless now. It might be better that do not set 
> watches.



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