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From "John Vines (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-605) NPE on MasterMonitorInfo also spammy
Date Tue, 29 May 2012 17:53:24 GMT


John Vines resolved ACCUMULO-605.

       Resolution: Fixed
    Fix Version/s: 1.5.0

May have been a side affect, but we now will ignore the mmi stats if it's null.
> NPE on MasterMonitorInfo also spammy
> ------------------------------------
>                 Key: ACCUMULO-605
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: monitor
>    Affects Versions: 1.5.0-SNAPSHOT
>            Reporter: John Vines
>            Assignee: John Vines
>             Fix For: 1.5.0
> 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(
>         at org.apache.accumulo.server.monitor.Monitor$
>         at
>         at
> 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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