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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1784) IFile should check for null compressor
Date Wed, 12 May 2010 02:00:41 GMT
IFile should check for null compressor
--------------------------------------

                 Key: MAPREDUCE-1784
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1784
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.22.0
            Reporter: Eli Collins
            Assignee: Eli Collins
            Priority: Minor
             Fix For: 0.22.0


IFile assumes that when it has a codec it can always get a compressor. This fails when mapred.compress.map.output
is true but the native libraries are not installed, resulting in an NPE:

{code}
java.lang.NullPointerException
at org.apache.hadoop.mapred.IFile$Writer.<init>(IFile.java:102)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1198)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1091)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:359)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
{code}

Let's make IFile handle this case by logging and using non-compressed streams.l

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