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From "Suraj Naik (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (AMBARI-25613) Concurrent Host Modification exception while sending INSTALL/START Host request
Date Tue, 02 Feb 2021 07:11:00 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-25613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suraj Naik resolved AMBARI-25613.
---------------------------------
    Resolution: Fixed

> Concurrent Host Modification exception while sending INSTALL/START Host request
> -------------------------------------------------------------------------------
>
>                 Key: AMBARI-25613
>                 URL: https://issues.apache.org/jira/browse/AMBARI-25613
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.7.6
>            Reporter: Suraj Naik
>            Priority: Major
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
>  
> {code:java}
> java.lang.RuntimeException: START Host request submission failed: java.lang.RuntimeException:
Update Host request submission failed: java.util.ConcurrentModificationException
> at org.apache.ambari.server.topology.AmbariContext.startHost(AmbariContext.java:497)
> at org.apache.ambari.server.topology.ClusterTopologyImpl.startHost(ClusterTopologyImpl.java:268)
> at org.apache.ambari.server.topology.tasks.StartHostTask.runTask(StartHostTask.java:51)
> at org.apache.ambari.server.topology.tasks.TopologyHostTask.run(TopologyHostTask.java:55)
> at org.apache.ambari.server.topology.HostOfferResponse$1.run(HostOfferResponse.java:85)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.RuntimeException: Update Host request submission failed: java.util.ConcurrentModificationException
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider$4.invoke(HostComponentResourceProvider.java:865)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider$4.invoke(HostComponentResourceProvider.java:852)
> at org.apache.ambari.server.controller.internal.AbstractResourceProvider.invokeWithRetry(AbstractResourceProvider.java:465)
> at org.apache.ambari.server.controller.internal.AbstractResourceProvider.modifyResources(AbstractResourceProvider.java:346)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider.doUpdateResources(HostComponentResourceProvider.java:852)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider.start(HostComponentResourceProvider.java:492)
> at org.apache.ambari.server.topology.AmbariContext.startHost(AmbariContext.java:494)
> at org.apache.ambari.server.topology.ClusterTopologyImpl.startHost(ClusterTopologyImpl.java:268)
> at org.apache.ambari.server.topology.tasks.StartHostTask.runTask(StartHostTask.java:51)
> at org.apache.ambari.server.topology.tasks.TopologyHostTask.run(TopologyHostTask.java:55)
> at org.apache.ambari.server.topology.HostOfferResponse$1.run(HostOfferResponse.java:85)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.util.ConcurrentModificationException: NA
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1479)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1477)
> at java.util.HashMap.putMapEntries(HashMap.java:512)
> at java.util.HashMap.<init>(HashMap.java:490)
> at org.apache.ambari.server.topology.HostRequest.getPhysicalTaskMapping(HostRequest.java:458)
> at org.apache.ambari.server.topology.LogicalRequest.getStageSummaries(LogicalRequest.java:286)
> at org.apache.ambari.server.topology.TopologyManager.getPendingHostComponents(TopologyManager.java:823)
> at org.apache.ambari.server.utils.StageUtils.getClusterHostInfo(StageUtils.java:306)
> at org.apache.ambari.server.controller.AmbariManagementControllerImpl.doStageCreation(AmbariManagementControllerImpl.java:2788)
> at org.apache.ambari.server.controller.AmbariManagementControllerImpl.addStages(AmbariManagementControllerImpl.java:3513)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider.updateHostComponents(HostComponentResourceProvider.java:707)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider$4.invoke(HostComponentResourceProvider.java:857)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider$4.invoke(HostComponentResourceProvider.java:852)
> at org.apache.ambari.server.controller.internal.AbstractResourceProvider.invokeWithRetry(AbstractResourceProvider.java:465)
> at org.apache.ambari.server.controller.internal.AbstractResourceProvider.modifyResources(AbstractResourceProvider.java:346)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider.doUpdateResources(HostComponentResourceProvider.java:852)
> at org.apache.ambari.server.controller.internal.HostComponentResourceProvider.start(HostComponentResourceProvider.java:492)
> at org.apache.ambari.server.topology.AmbariContext.startHost(AmbariContext.java:494)
> at org.apache.ambari.server.topology.ClusterTopologyImpl.startHost(ClusterTopologyImpl.java:268)
> at org.apache.ambari.server.topology.tasks.StartHostTask.runTask(StartHostTask.java:51)
> at org.apache.ambari.server.topology.tasks.TopologyHostTask.run(TopologyHostTask.java:55)
> at org.apache.ambari.server.topology.HostOfferResponse$1.run(HostOfferResponse.java:85)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>  
>  
>  
> My teammate [~ramkrishna] did some analysis on this one by adding logs and latches and
found that the installation and registration though done parallely each thread tries to get
the entire cluster’s view of the current physical tasks. So it is bound to happen that when
a registration is happening the other thread can do a getPhysicalTaskMapping().  (leading
to CME)
>  
>  
>   
>   



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