hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2943) Compression for intermediate map output is broken
Date Thu, 06 Mar 2008 02:32:57 GMT
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
            Reporter: Chris Douglas


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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message