Hi all, I would to run a benchmark of YARN service using the following command: yarn jar /usr/hdp/current/hadoop-mapreduce-client/hadoop-mapreduce-examples.jar terasort -Dmapred.reduce.tasks=10 -Dmapreduce.jobtracker.maxtasks.perjob=-1 -Dmapreduce.job.reduce.slowstart.completedmaps=1 /tmp/HA_ACCEPTANCE/teraInput1G /tmp/HA_ACCEPTANCE/teraOutput1G But i'm having this error: Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in fetcher#4 at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:170) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1869) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)Caused by: java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out. at org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.checkReducerHealth(ShuffleSchedulerImpl.java:366) at org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.copyFailed(ShuffleSchedulerImpl.java:288) at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:354) at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193) Anyone has any idea how to fix it? Thank you! ... View more