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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