[jira] [Updated] (MAPREDUCE-4030) 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

["Robert Joseph Evans (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Joseph Evans updated MAPREDUCE-4030:
-------------------------------------------

    Target Version/s: 0.23.3, 2.0.0, 3.0.0  (was: 0.23.2)
    
> 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
> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4030
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4030
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: Nishan Shetty
>            Assignee: Devaraj K
>
> 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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