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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2095) Reducer failed due to Out ofMemory
Date Tue, 23 Oct 2007 20:39:50 GMT
Reducer failed due to Out ofMemory
----------------------------------

                 Key: HADOOP-2095
                 URL: https://issues.apache.org/jira/browse/HADOOP-2095
             Project: Hadoop
          Issue Type: Bug
            Reporter: Runping Qi




One of the reducers of my job failed with the following exceptions.
The failure caused the whole job fail eventually.
Java heapsize was 768MB and sort.io.mb was 140.


2007-10-23 19:24:06,100 WARN org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Intermediate Merge of the inmemory files threw an exception: java.lang.OutOfMemoryError: Java
heap space
	at org.apache.hadoop.io.compress.DecompressorStream.(DecompressorStream.java:43)
	at org.apache.hadoop.io.compress.DefaultCodec.createInputStream(DefaultCodec.java:71)
	at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1345)
	at org.apache.hadoop.io.SequenceFile$Reader.(SequenceFile.java:1231)
	at org.apache.hadoop.io.SequenceFile$Reader.(SequenceFile.java:1154)
	at org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.nextRawKey(SequenceFile.java:2726)
	at org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(SequenceFile.java:2543)
	at org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2297)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$InMemFSMergeThread.run(ReduceTask.java:1311)
2007-10-23 19:24:06,102 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
done copying task_200710231912_0001_m_001428_0 output .
2007-10-23 19:24:06,185 INFO org.apache.hadoop.fs.FileSystem: Initialized InMemoryFileSystem:
ramfs://mapoutput31952838/task_200710231912_0001_r_000020_2/map_1423.out-0 of size (in bytes):
209715200
2007-10-23 19:24:06,193 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,193 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001215_0 output from xxx
2007-10-23 19:24:06,188 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001211_0 output from xxx
2007-10-23 19:24:06,185 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryOutputStream.close(InMemoryFileSystem.java:161)
	at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
	at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSOutputSummer.close(ChecksumFileSystem.java:312)
	at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
	at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
	at org.apache.hadoop.mapred.MapOutputLocation.getFile(MapOutputLocation.java:253)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:713)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,199 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001247_0 output from .
2007-10-23 19:24:06,200 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,204 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001422_0 output from .
2007-10-23 19:24:06,207 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,209 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001278_0 output from .
2007-10-23 19:24:06,198 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.io.IOException: task_200710231912_0001_r_000020_2The reduce copier failed
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:253)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
2007-10-23 19:24:06,198 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,231 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001531_0 output from .
2007-10-23 19:24:06,197 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)

2007-10-23 19:24:06,237 INFO org.apache.hadoop.mapred.ReduceTask: task_200710231912_0001_r_000020_2
Copying task_200710231912_0001_m_001227_0 output from .
2007-10-23 19:24:06,196 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$FileAttributes.access$300(InMemoryFileSystem.java:366)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem$InMemoryFileStatus.(InMemoryFileSystem.java:378)
	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:283)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:251)
	at org.apache.hadoop.fs.FileSystem.getLength(FileSystem.java:449)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:738)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:665)



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