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https://issues.apache.org/jira/browse/YARN-10194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091796#comment-17091796
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Brahma Reddy Battula commented on YARN-10194:
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[~sunilg] can you help to review this jira..?
> 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: Blocker
> Attachments: YARN-10194-001.patch, YARN-10194-002.patch,
> YARN-10194-003.patch, YARN-10194-004.patch, YARN-10194-005.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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