https://community.cloudera.com/t5/Support-Questions/YARN-Shuffle-failure/m-p/177427#M139675 <P>Hello,</P><P>I solved the issue. Now all is working fine.</P><P>The problem was an error in the <A href="http://sssd.conf">sssd.conf</A> file: </P><P style="margin-left: 20px;">I added :</P><P style="margin-left: 40px;">- use_fully_qualified_names = false</P><P style="margin-left: 20px;">Andd i deleted: </P><P style="margin-left: 40px;">- override_space: ^ </P><P style="margin-left: 40px;"> - default_domain_suffix: DOMAIN </P><P style="margin-left: 40px;"></P><P style="margin-left: 40px;"></P> Mon, 03 Sep 2018 14:53:49 GMT rania_triki93 2018-09-03T14:53:49Z https://community.cloudera.com/t5/Support-Questions/YARN-Shuffle-failure/m-p/177426#M139674 <P>Hi all,</P><P> I would to run a benchmark of YARN service using the following command:</P><PRE>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</PRE><P>But i'm having this error:</P><PRE>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)</PRE><P>Anyone has any idea how to fix it? </P><P>Thank you!</P> <P></P> Thu, 30 Aug 2018 20:46:53 GMT https://community.cloudera.com/t5/Support-Questions/YARN-Shuffle-failure/m-p/177426#M139674 rania_triki93 2018-08-30T20:46:53Z https://community.cloudera.com/t5/Support-Questions/YARN-Shuffle-failure/m-p/177427#M139675 <P>Hello,</P><P>I solved the issue. Now all is working fine.</P><P>The problem was an error in the <A href="http://sssd.conf">sssd.conf</A> file: </P><P style="margin-left: 20px;">I added :</P><P style="margin-left: 40px;">- use_fully_qualified_names = false</P><P style="margin-left: 20px;">Andd i deleted: </P><P style="margin-left: 40px;">- override_space: ^ </P><P style="margin-left: 40px;"> - default_domain_suffix: DOMAIN </P><P style="margin-left: 40px;"></P><P style="margin-left: 40px;"></P> Mon, 03 Sep 2018 14:53:49 GMT https://community.cloudera.com/t5/Support-Questions/YARN-Shuffle-failure/m-p/177427#M139675 rania_triki93 2018-09-03T14:53:49Z