checksum errors reading map output
----------------------------------
Key: HADOOP-680
URL: http://issues.apache.org/jira/browse/HADOOP-680
Project: Hadoop
Issue Type: Bug
Components: mapred
Reporter: Yoram Arnon
Assigned To: Owen O'Malley
we get many exceptions complaining about crc errors reading map output by
reducers:
org.apache.hadoop.fs.ChecksumException: Checksum error:
/hadoop/mapred/local/task_0189_r_000448_3/map_9683.out at 978944
at
org.apache.hadoop.fs.FSDataInputStream$Checker.verifySum(FSDataInputStream.java:136)
at
org.apache.hadoop.fs.FSDataInputStream$Checker.read(FSDataInputStream.java:112)
at
org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:187)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
at java.io.DataInputStream.readFully(DataInputStream.java:176)
at java.io.DataInputStream.readFully(DataInputStream.java:152)
at
org.apache.hadoop.io.SequenceFile$UncompressedBytes.reset(SequenceFile.java:274)
at
org.apache.hadoop.io.SequenceFile$UncompressedBytes.access$700(SequenceFile.java:261)
at
org.apache.hadoop.io.SequenceFile$Reader.nextRaw(SequenceFile.java:1338)
at
org.apache.hadoop.io.SequenceFile$Sorter$SortPass.run(SequenceFile.java:1600)
at
org.apache.hadoop.io.SequenceFile$Sorter.sortPass(SequenceFile.java:1538)
at org.apache.hadoop.io.SequenceFile$Sorter.sort(SequenceFile.java:1511)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:245)
at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1210)
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