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https://issues.apache.org/jira/browse/MAPREDUCE-857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karam Singh updated MAPREDUCE-857:
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Affects Version/s: 0.21.0
Fix Version/s: (was: 0.21.0)
> task fails with NPE when GzipCodec is used for
> mapred.map.output.compression.codec and native libary is not present
> --------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-857
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-857
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task
> Affects Versions: 0.21.0
> Reporter: Karam Singh
>
> Ran a job with
> mapred.map.output.compression.codec=org.apache.hadoop.io.compress.GzipCodec.
> Whenmaps of job completes they with following NPE -:
> tasklog -:
> 2009-08-12 13:48:13,423 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb =
> 256
> 2009-08-12 13:48:13,611 INFO org.apache.hadoop.mapred.MapTask: data buffer =
> 204010944/214748368
> 2009-08-12 13:48:13,611 INFO org.apache.hadoop.mapred.MapTask: record buffer
> = 3187670/3355443
> 2009-08-12 13:49:45,473 INFO org.apache.hadoop.mapred.MapTask: Starting flush
> of map output
> 2009-08-12 13:49:45,544 WARN org.apache.hadoop.util.NativeCodeLoader: Unable
> to load native-hadoop library for your platform... using builtin-java classes
> where applicable
> 2009-08-12 13:49:45,545 INFO org.apache.hadoop.io.compress.CodecPool: Got
> brand-new compressor
> 2009-08-12 13:49:45,546 WARN org.apache.hadoop.mapred.Child: Error running
> child : java.lang.NullPointerException
> at org.apache.hadoop.mapred.IFile$Writer.<init>(IFile.java:105)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1248)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1146)
> at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:528)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:604)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:318)
> at org.apache.hadoop.mapred.Child.main(Child.java:162)
> Line 105 of IFile.java contains followings line in trunk code on which error
> was seen -:
> Line 104: this.compressor = CodecPool.getCompressor(codec);
> Line: this.compressor.reset();
> If native is available job runs successfully without any failures
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