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MapReduce, mail # user - Map Rask has IO exception


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Map Rask has IO exception
Steve Lewis 2011-11-05, 17:09
My job is dying during a  map task write. This happened in enough task
to kill the job although most tasks succeeded -

Any ideas as to where to start diagnosing the problem

Caused by: java.lang.NullPointerException
at org.apache.hadoop.io.compress.BZip2Codec$BZip2CompressionOutputStream.write(BZip2Codec.java:200)
at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:41)
at java.io.DataOutputStream.writeByte(DataOutputStream.java:136)
at org.apache.hadoop.io.WritableUtils.writeVLong(WritableUtils.java:263)
at org.apache.hadoop.io.WritableUtils.writeVInt(WritableUtils.java:243)
at org.apache.hadoop.mapred.IFile$Writer.close(IFile.java:126)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1242)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.access$1800(MapTask.java:648)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer$SpillThread.run(MapTask.java:1135)

--
Steven M. Lewis PhD
4221 105th Ave NE
Kirkland, WA 98033
206-384-1340 (cell)
Skype lordjoe_com