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https://issues.apache.org/jira/browse/HADOOP-2036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nigel Daley updated HADOOP-2036:
--------------------------------
Attachment: 2036.patch
The ThreadMXBean.getThreadInfo method states that elements of the returned
array may be null if the thread is no longer alive or doesn't exist. The
attached patch checks for this state.
> NPE in JvmMetrics.doThreadUpdates
> ---------------------------------
>
> Key: HADOOP-2036
> URL: https://issues.apache.org/jira/browse/HADOOP-2036
> Project: Hadoop
> Issue Type: Bug
> Components: metrics
> Affects Versions: 0.14.1
> Reporter: Koji Noguchi
> Priority: Blocker
> Fix For: 0.15.0
>
> Attachments: 2036.patch
>
>
> It showed on task's stderr. Didn't fail the task directly.
> java.lang.NullPointerException
> at
> org.apache.hadoop.metrics.jvm.JvmMetrics.doThreadUpdates(JvmMetrics.java:129)
> at org.apache.hadoop.metrics.jvm.JvmMetrics.doUpdates(JvmMetrics.java:79)
> at
> org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:284)
> 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(Timer.java:512)
> at java.util.TimerThread.run(Timer.java:462)
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