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From "Prabhu Joseph (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6981) Map Progress is misleading for Distcp job
Date Wed, 11 Oct 2017 14:01:00 GMT
Prabhu Joseph created MAPREDUCE-6981:

             Summary: Map Progress is misleading for Distcp job
                 Key: MAPREDUCE-6981
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6981
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: distcp
    Affects Versions: 2.7.3
            Reporter: Prabhu Joseph
            Priority: Minor

The Progress displayed by client when running Distcp job is misleading. The Map Progress reaches
100% earlier than the map tasks finishes. The issue reproduced by just running Distcp with
multiple huge files. 

JobImpl returns progress 1.0 when either task finishes or task progress is 1.0. The MapTask
of Distcp gets the progress from SequenceFileRecordReader which looks like updates the progress
after reading the list of files and which does not account the time taken to copy the files
into Destination.

17/10/11 13:33:29 INFO mapreduce.Job:  map 100% reduce 0%
17/10/11 13:34:47 INFO mapreduce.Job: Job job_1506610341926_0016 completed successfully

The MapTask Progress is displayed at 17/10/11 13:33:29 whereas the last map task finishes
at 2017-10-11 13:34:45

2017-10-11 13:34:45,159 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskImpl:
task_1506610341926_0016_m_000002 Task Transitioned from RUNNING to SUCCEEDED

Attaching the client and application logs.

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