Error Recovery failed, task will continue but run forever as new data only
comes in very very slowly
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Key: MAPREDUCE-1264
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1264
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 0.20.1
Reporter: Thibaut
Hi,
Sometimes, some of my jobs (It normally always happens in the reducers and on
random basis) will not finish and will run forever. I have to manually fail the
task so the task will be started and be finished.
The error log on the node is full of entries like:
java.io.IOException: Error Recovery for block blk_-8036012205502614140_21582139
failed because recovery from primary datanode 192.168.0.3:50011 failed 6
times. Pipeline was 192.168.0.3:50011. Aborting...
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.processDatanodeError(DFSClient.java:2582)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$1600(DFSClient.java:2076)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2239)
java.io.IOException: Error Recovery for block blk_-8036012205502614140_21582139
failed because recovery from primary datanode 192.168.0.3:50011 failed 6
times. Pipeline was 192.168.0.3:50011. Aborting...
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.processDatanodeError(DFSClient.java:2582)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$1600(DFSClient.java:2076)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2239)
java.io.IOException: Error Recovery for block blk_-8036012205502614140_21582139
failed because recovery from primary datanode 192.168.0.3:50011 failed 6
times. Pipeline was 192.168.0.3:50011. Aborting...
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.processDatanodeError(DFSClient.java:2582)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$1600(DFSClient.java:2076)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2239)
The error entries all refer to the same data block.
Unfortunally, the reduce function still seems to be called in the reducer with
valid data (allthough very very slowly), so the task will never been killed and
restarted and will take forever to run!
I experienced the same problem under version 0.20.0 as well.
Thanks,
Thibaut
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