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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-564) Add counter for Succeded Maps and Succeeded Reduces
Date Wed, 09 Sep 2009 05:39:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752914#action_12752914
] 

Amareshwari Sriramadasu commented on MAPREDUCE-564:
---------------------------------------------------

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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