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https://issues.apache.org/jira/browse/MAPREDUCE-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752914#action_12752914
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Amareshwari Sriramadasu commented on MAPREDUCE-564:
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At the job completion, Number of succeeded maps is nothing but the difference
betweeb number of launched maps and failed maps. The counter is actually
redudant information.
bq. BandwidthMonitor in distcp uses these counters (Succeeded Maps) to get the
number of running maps.
If you want to know number of running maps at any time, it should be part of
JobStatus, and can exposed to client through RunningJob.
> Add counter for Succeded Maps and Succeeded Reduces
> ---------------------------------------------------
>
> Key: MAPREDUCE-564
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-564
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 0.21.0
> Reporter: Ravi Gummadi
> Assignee: Ravi Gummadi
> Fix For: 0.21.0
>
> Attachments: MR-564.patch, MR-564.v1.patch
>
>
> Add counters for Number of Succeeded Maps and Number of Succeeded Reduces so
> that client can get this number without iterating through all the task
> reports while the job is in progress.
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