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From "David Bowen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1091) NPE from Simon in JT stdout
Date Thu, 08 Mar 2007 17:48:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Bowen updated HADOOP-1091:
--------------------------------

    Status: Patch Available  (was: Open)

>   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
>         Assigned To: David Bowen
>             Fix For: 0.12.1
>
>         Attachments: 1091.patch
>
>
> 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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