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Date: Fri, 7 Mar 2008 10:57:46 -0800 (PST)
From: "Chris Douglas (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2943) Compression for intermediate map
 output is broken
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     [ https://issues.apache.org/jira/browse/HADOOP-2943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Douglas updated HADOOP-2943:
----------------------------------

    Attachment: 2943.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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