[MAPREDUCE-5028] Maps fail when io.sort.mb is set to high value

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.1.1, 2.0.3-alpha, 0.23.5
• Fix Version/s: 1.2.0, 2.4.0
• Target Version/s: 0.23.11, 2.4.0
• Hadoop Flags: Reviewed
• Assignee: Karthik Kambatla
• Reporter: Karthik Kambatla
• Created: 26/Feb/13 03:54
• Updated: 03/Nov/14 18:34
• Resolved: 11/Mar/14 01:31

Description

Verified the problem exists on branch-1 with the following configuration:

Pseudo-dist mode: 2 maps/ 1 reduce, mapred.child.java.opts=-Xmx2048m, io.sort.mb=1280, dfs.block.size=2147483648

Run teragen to generate 4 GB data
Maps fail when you run wordcount on this configuration with the following error:

java.io.IOException: Spill failed
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1031)
	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:692)
	at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
	at org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:45)
	at org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:34)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:766)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
	at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.io.EOFException
	at java.io.DataInputStream.readInt(DataInputStream.java:375)
	at org.apache.hadoop.io.IntWritable.readFields(IntWritable.java:38)
	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67)
	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40)
	at org.apache.hadoop.mapreduce.ReduceContext.nextKeyValue(ReduceContext.java:116)
	at org.apache.hadoop.mapreduce.ReduceContext.nextKey(ReduceContext.java:92)
	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:175)
	at org.apache.hadoop.mapred.Task$NewCombinerRunner.combine(Task.java:1505)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1438)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.access$1800(MapTask.java:855)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer$SpillThread.run(MapTask.java:1346)

Issue Links

• is related to: MAPREDUCE-5031 Maps hitting IndexOutOfBoundsException for higher values of mapreduce.task.io.sort.mb
• relates to: MAPREDUCE-5032 MapTask.MapOutputBuffer contains arithmetic overflows