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From "David Bowen (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1091) NPE from Simon in JT stdout
Date Thu, 08 Mar 2007 17:36:24 GMT
  NPE from Simon in JT stdout 

                 Key: HADOOP-1091
                 URL: https://issues.apache.org/jira/browse/HADOOP-1091
             Project: Hadoop
          Issue Type: Bug
            Reporter: David Bowen
             Fix For: 0.12.1

Seen in JT std out:

Exception in thread "Timer-0" java.lang.NullPointerException
        at com.yahoo.simon.hadoop.metrics.Client.computeBlurbSize(Unknown Source)
        at com.yahoo.simon.hadoop.metrics.Client.sendBlurb(Unknown Source)
        at com.yahoo.simon.hadoop.metrics.SimonContext.emitRecord(Unknown Source)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:295)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:48)
        at org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:242)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462) 

There are (at least) two bugs:

   (1) o.a.h.metrics.MetricsRecord.setTag(String name, String value) will
   cause this problem to happen (later) if value==null.  It should treat a
   null value as equivalent to an empty string.
   (2) o.a.h.mapred.Counters.getGroupNames returns a collection which may
   be getting updated concurrently.  It needs to make a copy.

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