Details
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Bug
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Status: Resolved
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Major
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Resolution: Invalid
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None
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None
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None
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None
Description
Many reduce tasks got killed due to checksum error. The strange thing is that the file was generated by the sort function, and was on a local disk. Here is the stack:
Checksum error: ../task_0011_r_000140_0/all.2.1 at 5342920704
at org.apache.hadoop.fs.FSDataInputStream$Checker.verifySum(FSDataInputStream.java:134)
at org.apache.hadoop.fs.FSDataInputStream$Checker.read(FSDataInputStream.java:110)
at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:170)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
at java.io.DataInputStream.readFully(DataInputStream.java:176)
at org.apache.hadoop.io.DataOutputBuffer$Buffer.write(DataOutputBuffer.java:55)
at org.apache.hadoop.io.DataOutputBuffer.write(DataOutputBuffer.java:89)
at org.apache.hadoop.io.SequenceFile$Reader.readBuffer(SequenceFile.java:1061)
at org.apache.hadoop.io.SequenceFile$Reader.seekToCurrentValue(SequenceFile.java:1126)
at org.apache.hadoop.io.SequenceFile$Reader.nextRaw(SequenceFile.java:1354)
at org.apache.hadoop.io.SequenceFile$Sorter$MergeStream.next(SequenceFile.java:1880)
at org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(SequenceFile.java:1938)
at org.apache.hadoop.io.SequenceFile$Sorter$MergePass.run(SequenceFile.java:1802)
at org.apache.hadoop.io.SequenceFile$Sorter.mergePass(SequenceFile.java:1749)
at org.apache.hadoop.io.SequenceFile$Sorter.sort(SequenceFile.java:1494)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:240)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1066)