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https://issues.apache.org/jira/browse/HADOOP-2943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated HADOOP-2943:
----------------------------------
Status: Patch Available (was: Open)
Updated patch
> Compression for intermediate map output is broken
> -------------------------------------------------
>
> Key: HADOOP-2943
> URL: https://issues.apache.org/jira/browse/HADOOP-2943
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.0
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Fix For: 0.17.0
>
> Attachments: 2943.patch, 2943.patch, 2943.patch, 2943.patch
>
>
> It looks like SequenceFile::RecordCompressWriter and
> SequenceFile::BlockCompressWriter weren't updated to use the new
> serialization added in HADOOP-1986. This causes failures in the merge when
> mapred.compress.map.output is true and
> mapred.map.output.compression.type=BLOCK:
> {noformat}
> java.io.IOException: File is corrupt!
> at
> org.apache.hadoop.io.SequenceFile$Reader.readBlock(SequenceFile.java:1656)
> at
> org.apache.hadoop.io.SequenceFile$Reader.nextRawKey(SequenceFile.java:1969)
> at
> org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.nextRawKey(SequenceFile.java:2985)
> at
> org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(SequenceFile.java:2785)
> at
> org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2494)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:654)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:740)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:212)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2077)
> {noformat}
> mapred.map.output.compression.type=RECORD works for Writables, but should be
> updated.
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