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From "Suraj Naik (Jira)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-25613) Concurrent Host Modification exception while sending INSTALL/START Host request
Date Sun, 31 Jan 2021 11:02:00 GMT
Suraj Naik created AMBARI-25613:
-----------------------------------

             Summary: 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


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)

 

 

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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