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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-179) On hadoop 0.16, some jobs using combiner fail with an NPE
Date Wed, 02 Apr 2008 21:29:24 GMT
On hadoop 0.16, some jobs using combiner fail with an NPE
---------------------------------------------------------

                 Key: PIG-179
                 URL: https://issues.apache.org/jira/browse/PIG-179
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.0.0
         Environment: Hadoop 0.16
            Reporter: Alan Gates
            Assignee: Alan Gates


Some jobs (it appears to only be larger jobs) now fail with an NPE in the combiner code on
this line:

{code}
PigSplit split = PigInputFormat.PigRecordReader.getPigRecordReader().getPigFileSplit();
{code}

Looking into the PigRecordReader a comment in the class indicates that, as implemented, it
depends on the mapper and splitter (and in this case the combiner as well) running in the
same thread.  It seems that in some cases in hadoop 0.16 this is no longer the case.

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