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Date: Wed, 6 Nov 2013 14:11:17 +0000 (UTC)
From: "Oleksandr Diachenko (JIRA)" <jira@apache.org>
To: ambari-dev@incubator.apache.org
Message-ID: <JIRA.12677771.1383746965529.28233.1383747077023@arcas>
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References: <JIRA.12677771.1383746965529@arcas>
Subject: [jira] [Created] (AMBARI-3703) ConcurrentModificationException in
 Ambari Server log
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Oleksandr Diachenko created AMBARI-3703:
-------------------------------------------

             Summary: ConcurrentModificationException in Ambari Server log
                 Key: AMBARI-3703
                 URL: https://issues.apache.org/jira/browse/AMBARI-3703
             Project: Ambari
          Issue Type: Task
          Components: controller, test
    Affects Versions: 1.4.1
            Reporter: Oleksandr Diachenko
            Assignee: Oleksandr Diachenko
             Fix For: 1.4.2
         Attachments: AMBARI-3703.patch

This is an unlikely repro. However, we can go through the code to see if we can find out possible cause.

{code}
01:56:26,714  WARN [Thread-2] HeartbeatMonitor:98 - Exception received
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
        at org.apache.ambari.server.agent.HeartbeatMonitor.generateStatusCommands(HeartbeatMonitor.java:185)
        at org.apache.ambari.server.agent.HeartbeatMonitor.doWork(HeartbeatMonitor.java:164)
        at org.apache.ambari.server.agent.HeartbeatMonitor.run(HeartbeatMonitor.java:90)
        at java.lang.Thread.run(Thread.java:662)
{code}


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