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https://issues.apache.org/jira/browse/MAPREDUCE-1784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins resolved MAPREDUCE-1784.
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Resolution: Fixed
Fix Version/s: 0.20.3
Hadoop Flags: [Reviewed]
I merged HDFS-727 from trunk into branch-0.20, ran the libhdfs test and
committed.
> 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: 0.20.3, 0.22.0
>
> Attachments: mapred-1784-1.patch
>
>
> 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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