Streaming reducer stuck after detecting corrupted inputs
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Key: HADOOP-3075
URL: https://issues.apache.org/jira/browse/HADOOP-3075
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Runping Qi
A reducer of a streaming job was stuck at 89% after detecting exception from
child.
Below is the stack:
2008-03-22 19:29:00,649 INFO org.apache.hadoop.streaming.PipeMapRed:
R/W/S=155701/155680/0 in:710=155701/219 [rec/s] out:710=155680/219 [rec/s]
2008-03-22 19:29:00,667 WARN org.apache.hadoop.mapred.TaskTracker: Error
running child
java.lang.RuntimeException: problem advancing
at
org.apache.hadoop.mapred.ReduceTask$ValuesIterator.next(ReduceTask.java:238)
at
org.apache.hadoop.mapred.ReduceTask$ReduceValuesIterator.next(ReduceTask.java:314)
at org.apache.hadoop.streaming.PipeReducer.reduce(PipeReducer.java:67)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:394)
at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2073)
Caused by: java.io.IOException: File is corrupt!
at
org.apache.hadoop.io.SequenceFile$Reader.readRecordLength(SequenceFile.java:1855)
at
org.apache.hadoop.io.SequenceFile$Reader.nextRawKey(SequenceFile.java:1972)
at
org.apache.hadoop.io.SequenceFile$Sorter$SegmentDescriptor.nextRawKey(SequenceFile.java:3005)
at
org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.next(SequenceFile.java:2763)
at
org.apache.hadoop.mapred.ReduceTask$ValuesIterator.readNextKey(ReduceTask.java:275)
at
org.apache.hadoop.mapred.ReduceTask$ValuesIterator.next(ReduceTask.java:236)
The task did not fail but just got stuck.
Speculative execution did not kick in.
The hadoop was built off trunk Version: 0.17.0-dev, r638716
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