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https://issues.apache.org/jira/browse/MAPREDUCE-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657840#comment-13657840
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Mike Roark commented on MAPREDUCE-3859:
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I applied Sergey's patch from the first comment in my cdh3u5 cluster and had
some improvement for jobs with 3 slots per task, but the numbers did not change
for other sizes of tasks. Sergey, do you think I'm doing something wrong?
Same setup as above:
https://issues.apache.org/jira/browse/MAPREDUCE-3859?focusedCommentId=13609117&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13609117
||mapred.reduce.tasks||slots per reducer||expected running tasks||running tasks
without patch||using slots without patch||running tasks with patch||using slots
with patch||
|30|1|30|30|30|30|30|
|30|2|30|{color:red}16{color}|32|16|32|
|30|3|20|{color:red}1{color}|3|{color:green}11{color}|33|
|30|4|10|{color:red}8{color}|32|8|32|
|30|5|10|{color:red}8{color}|40|8|40|
|30|6|10|{color:red}8{color}|48|8|48|
> CapacityScheduler incorrectly utilizes extra-resources of queue for
> high-memory jobs
> ------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3859
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3859
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: capacity-sched
> Affects Versions: 1.0.0
> Environment: CDH3u1
> Reporter: Sergey Tryuber
> Assignee: Sergey Tryuber
> Attachments: test-to-fail.patch.txt
>
>
> Imagine, we have a queue A with capacity 10 slots and 20 as extra-capacity,
> jobs which use 3 map slots will never consume more than 9 slots, regardless
> how many free slots on a cluster.
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