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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4137) NPE in GangliaContext.xdr_string (GangliaContext.java:195)
Date Sat, 04 Oct 2008 20:29:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636855#action_12636855

Hadoop QA commented on HADOOP-4137:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 701476.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3432/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3432/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3432/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3432/console

This message is automatically generated.

> NPE in GangliaContext.xdr_string (GangliaContext.java:195)
> ----------------------------------------------------------
>                 Key: HADOOP-4137
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4137
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.18.0, 0.18.1
>            Reporter: Michael Bieniosek
>         Attachments: hadoop_ganglia_npe-4137.patch
> Exception in thread "Timer thread for monitoring dfs" java.lang.NullPointerException
>         at org.apache.hadoop.metrics.ganglia.GangliaContext.xdr_string(GangliaContext.java:195)
>         at org.apache.hadoop.metrics.ganglia.GangliaContext.emitMetric(GangliaContext.java:138)
>         at org.apache.hadoop.metrics.ganglia.GangliaContext.emitRecord(GangliaContext.java:123)
>         at org.apache.hadoop.metrics.spi.AbstractMetricsContext.emitRecords(AbstractMetricsContext.java:304)
>         at org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:290)
>         at org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:50)
>         at org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:249)
>         at java.util.TimerThread.mainLoop(Unknown Source)
>         at java.util.TimerThread.run(Unknown Source)
> It looks like this caused the datanode to hang, though I accidentally killed the datanode
before I could dump its stack.

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