Jason Lowe created MAPREDUCE-5059:
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Summary: Job overview shows average merge time larger than for any
reduce attempt
Key: MAPREDUCE-5059
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5059
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobhistoryserver, webapps
Reporter: Jason Lowe
When looking at a job overview page on the history server, the Average Merge
Time is often reported with a value that is far larger than the Elapsed Merge
Time shown for any reduce task attempt. The job overview page calculates the
merge time as the time delta between the sort finishing and the job launching
while the attempts page calculates it as the time delta between the sort
finishing and the shuffle finishing.
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