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https://issues.apache.org/jira/browse/YARN-11766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17924870#comment-17924870
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ASF GitHub Bot commented on YARN-11766:
---------------------------------------

hadoop-yetus commented on PR #7365:
URL: https://github.com/apache/hadoop/pull/7365#issuecomment-2642759714

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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[/results-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7365/1/artifact/out/results-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt)
 |  
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:
 The patch generated 31 new + 24 unchanged - 0 fixed = 55 total (was 24)  |
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   |||| _ Other Tests _ |
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   |  |   | 135m 50s |  |  |
   
   
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> Implement DELAYED_OR operator in the scheduling process for Rich Placement 
> Constraint
> -------------------------------------------------------------------------------------
>
>                 Key: YARN-11766
>                 URL: https://issues.apache.org/jira/browse/YARN-11766
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>            Priority: Major
>              Labels: pull-request-available
>
> DELAYED_OR operator has been defined in the [Rich Placement Constraints 
> Design 
> doc|https://issues.apache.org/jira/secure/attachment/12867869/YARN-6592-Rich-Placement-Constraints-Design-V1.pdf],
>  and is already existing in the API. But haven't been implemented in the 
> scheduling process yet.
> This ticket will implement DELAYED_OR operator in the scheduling process to 
> support soft placement constraints requirements, according to the description 
> in design doc:
> {code}
> DELAYED_OR: Similar to OR, but supports ordering and delays for constraints.
> Example : Try for 2 mins to place me to host n1; then try for 3 mins to place 
> me on rack r1; if everything else fails, place me on any node. The following 
> delay criteria can be specified to control the following:
> * Number of units of delay for each constraint in the expression.
> * Units of delay can be either missed opportunities or wall clock time.
> * Ability to reset units of delay after one of the allocations gets allocated
> (similar to today’s resetRackDelay).
> {code}
> The last delay criteria has been improved to make it usable: It's reasonable 
> to reset units of delay after one of the allocations gets allocated for 
> OPPORTUNITIES delay-unit, but for MILLISECONDS delay-unit, the update time 
> should be reset only when the request is updated, otherwise the request with 
> large size will be satisfied slowly: one by one satisfied with the specified 
> delay interval. For example, if we specified the DELAY_OR constraint for a 
> request with 100 containers and the delay interval is 1 minute,  it is 
> expected to be satisfied after 1 minute instead of 100 minutes for all the 
> 100 containers.



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