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Date: Mon, 7 Dec 2015 18:32:11 +0000 (UTC)
From: "Junping Du (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12919799.1449513096000.292043.1449513131216@Atlassian.JIRA>
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 <JIRA.12919799.1449513096239@arcas>
Subject: [jira] [Created] (YARN-4431) Not necessary to do unRegisterNM() if
 NM get stop due to failed to connect to RM
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Junping Du created YARN-4431:
--------------------------------

             Summary: Not necessary to do unRegisterNM() if NM get stop due to failed to connect to RM
                 Key: YARN-4431
                 URL: https://issues.apache.org/jira/browse/YARN-4431
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Junping Du
            Assignee: Junping Du


{noformat}
2015-12-07 12:16:57,873 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-12-07 12:16:58,874 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-12-07 12:16:58,876 WARN org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl: Unregistration of the Node 10.200.10.53:25454 failed.
java.net.ConnectException: Call From jduMBP.local/10.200.10.53 to 0.0.0.0:8031 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
        at sun.reflect.GeneratedConstructorAccessor30.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
        at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792)
        at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732)
        at org.apache.hadoop.ipc.Client.call(Client.java:1452)
        at org.apache.hadoop.ipc.Client.call(Client.java:1385)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)
        at com.sun.proxy.$Proxy74.unRegisterNodeManager(Unknown Source)
        at org.apache.hadoop.yarn.server.api.impl.pb.client.ResourceTrackerPBClientImpl.unRegisterNodeManager(ResourceTrackerPBClientImpl.java:98)
        at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:255)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:103)
        at com.sun.proxy.$Proxy75.unRegisterNodeManager(Unknown Source)
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.unRegisterNM(NodeStatusUpdaterImpl.java:267)
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStop(NodeStatusUpdaterImpl.java:245)
        at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
        at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
        at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
        at org.apache.hadoop.service.CompositeService.stop(CompositeService.java:157)
        at org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:131)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceStop(NodeManager.java:377)
{noformat}
If RM down for some reason, NM's NodeStatusUpdaterImpl will retry the connection with proper retry policy. After retry the maximum times (15 minutes by default), it will send NodeManagerEventType.SHUTDOWN to shutdown NM. But NM shutdown will call NodeStatusUpdaterImpl.serviceStop() which will call unRegisterNM() to unregister NM from RM and get retry again (another 15 minutes). This is completely unnecessary and we should skip unRegisterNM when NM get shutdown because of connection issues.


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