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https://issues.apache.org/jira/browse/HADOOP-4445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642089#action_12642089
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Sreekanth Ramakrishnan commented on HADOOP-4445:
------------------------------------------------

I had an offline discussion with Karam about this issue, as mentioned in his 
comment, this indeed happens for a short duration between heartbeats when the 
task slots are actually getting assigned for a particular job. And the cluster 
information and scheduling information get synched up in the next heartbeat.

> Wrong number of running map/reduce tasks are displayed in queue information.
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-4445
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4445
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.19.0
>         Environment: Hadoop r705159, Queue=default, GC=100% 
> MapCapacity=ReduceCapacity=212
>            Reporter: Karam Singh
>            Assignee: Sreekanth Ramakrishnan
>
> Wrong number of running map/reduce tasks are displayed in queue information.

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