If the nodemanager on which the maptask is executed is going down before the
mapoutput is consumed by the reducer,then the job is failing with shuffle error
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Key: MAPREDUCE-4030
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4030
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Reporter: Nishan Shetty
My cluster has 2 NM's.
The value of "mapreduce.job.reduce.slowstart.completedmaps" is set to 1.
When the job execution is in progress and Mappers has finished about 99%
completion,one of the NM has gone down.
The job has failed with the following trace
"Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in
shuffle in fetcher#1 at
org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:123) at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:371) at
org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:148) 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:1177)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:143) Caused by:
java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out. at
org.apache.hadoop.mapreduce.task.reduce.ShuffleScheduler.checkReducerHealth(ShuffleScheduler.java:253)
at
org.apache.hadoop.mapreduce.task.reduce.ShuffleScheduler.copyFailed(ShuffleScheduler.java:187)
at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:240)
at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:152) "
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