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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-605) NPE on MasterMonitorInfo also spammy
Date Thu, 24 May 2012 14:32:54 GMT
John Vines created ACCUMULO-605:
-----------------------------------

             Summary: NPE on MasterMonitorInfo also spammy
                 Key: ACCUMULO-605
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-605
             Project: Accumulo
          Issue Type: Bug
          Components: monitor
    Affects Versions: 1.5.0-SNAPSHOT
            Reporter: John Vines
            Assignee: John Vines


Just like ACCUMULO-604, this message started occuring when the master went down. Got the following
message-
23 11:06:33,862 [monitor.Monitor] WARN : 
java.lang.NullPointerException
        at org.apache.accumulo.server.monitor.Monitor.fetchData(Monitor.java:320)
        at org.apache.accumulo.server.monitor.Monitor$2.run(Monitor.java:501)
        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Thread.java:680)

This message occurred very ~5 seconds or so, and we had instances of it occurring around 7k
times as well. The frequency of this and ACCUMULO-604 makes me wonder if we have a weird threading
issue, or something along those lines (however, when I jstacked the monitor I didn't see thousands
of threads, so I'm doubtful).

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