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https://issues.apache.org/jira/browse/YARN-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916038#comment-16916038
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Bibin A Chundatt commented on YARN-9738:
----------------------------------------
[~BilwaST]
As discussed offline need to handle get to nodes using null key.
> Remove lock on ClusterNodeTracker#getNodeReport as it blocks application
> submission
> -----------------------------------------------------------------------------------
>
> Key: YARN-9738
> URL: https://issues.apache.org/jira/browse/YARN-9738
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Bilwa S T
> Assignee: Bilwa S T
> Priority: Major
> Attachments: YARN-9738-001.patch, YARN-9738-002.patch
>
>
> *Env :*
> Server OS :- UBUNTU
> No. of Cluster Node:- 9120 NMs
> Env Mode:- [Secure / Non secure]Secure
> *Preconditions:*
> ~9120 NM's was running
> ~1250 applications was in running state
> 35K applications was in pending state
> *Test Steps:*
> 1. Submit the application from 5 clients, each client 2 threads and total 10
> queues
> 2. Once application submittion increases (for each application of
> distributted shell will call getClusterNodes)
> *ClientRMservice#getClusterNodes tries to get
> ClusterNodeTracker#getNodeReport where map nodes is locked.*
> {quote}
> "IPC Server handler 36 on 45022" #246 daemon prio=5 os_prio=0
> tid=0x00007f75095de000 nid=0x1949c waiting on condition [0x00007f74cff78000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00007f759f6d8858> (a
> java.util.concurrent.locks.ReentrantReadWriteLock$FairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker.getNodeReport(ClusterNodeTracker.java:123)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler.getNodeReport(AbstractYarnScheduler.java:449)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.createNodeReports(ClientRMService.java:1067)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getClusterNodes(ClientRMService.java:992)
> at
> org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getClusterNodes(ApplicationClientProtocolPBServiceImpl.java:313)
> at
> org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:589)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:530)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1036)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:928)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:863)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2792)
> {quote}
> *Instead we can make nodes as concurrentHashMap and remove readlock*
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