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https://issues.apache.org/jira/browse/YARN-10194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17067364#comment-17067364
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Prabhu Joseph commented on YARN-10194:
--------------------------------------

[~sunilg] Have attached  [^YARN-10194-004.patch]  after rebasing. Thanks.

> YARN RMWebServices /scheduler-conf/validate leaks ZK Connections
> ----------------------------------------------------------------
>
>                 Key: YARN-10194
>                 URL: https://issues.apache.org/jira/browse/YARN-10194
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 3.3.0
>            Reporter: Akhil PB
>            Assignee: Prabhu Joseph
>            Priority: Critical
>         Attachments: YARN-10194-001.patch, YARN-10194-002.patch, 
> YARN-10194-003.patch, YARN-10194-004.patch
>
>
> YARN RMWebServices /scheduler-conf/validate leaks ZK Connections. Validation 
> API creates a new CapacityScheduler and missed to close after the validation. 
> Every CapacityScheduler#init opens MutableCSConfigurationProvider which opens 
> ZKConfigurationStore and creates a ZK Connection. 
> *ZK LOGS*
> {code}
> -03-12 16:45:51,881 WARN org.apache.zookeeper.server.NIOServerCnxnFactory: [2 
> times] Error accepting new connection: Too many connections from 
> /172.27.99.64 - max is 60
> 2020-03-12 16:45:52,449 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: Error accepting new 
> connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:52,710 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: Error accepting new 
> connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:52,876 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: [4 times] Error accepting 
> new connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:53,068 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: [2 times] Error accepting 
> new connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:53,391 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: [2 times] Error accepting 
> new connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:54,008 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: Error accepting new 
> connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:54,287 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: Error accepting new 
> connection: Too many connections from /172.27.99.64 - max is 60
> 2020-03-12 16:45:54,483 WARN 
> org.apache.zookeeper.server.NIOServerCnxnFactory: [4 times] Error accepting 
> new connection: Too many connections from /172.27.99.64 - max is 60
> {code}
> And there is an another bug in ZKConfigurationStore which has not handled 
> close() of ZKCuratorManager.



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