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Date: Sat, 13 Nov 2010 00:58:14 -0500 (EST)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Resolved: (MAPREDUCE-1784) IFile should check for null
 compressor
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins resolved MAPREDUCE-1784.
------------------------------------

       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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