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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject ***UNCHECKED*** [jira] [Commented] (YARN-7780) Documentation for Placement Constraints
Date Fri, 26 Jan 2018 18:43:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341417#comment-16341417
] 

Arun Suresh commented on YARN-7780:
-----------------------------------

Thanks [~kkaranasos].

Couple of minor nits:
line 28: "This document focuses on" -> "This feature deals with / focuses on"
line 32: "that is, if the constraints for a container cannot be satisfied given the current
cluster condition": we need to complete the sentence with ".. the Request is rejected and
notified to the AM." - And lets move this line to the bottom - since it is specific to the
processor.
line 34: Think we should remove this - allocation == since container at the moment.

At the end also mention:
"The 'AllocateRequest' has also been modified to include an optional collection to 'SchedulingRequest'
objects in it 'scheduling_requests' field in addition to the existing 'ask' field (which takes
'ResourceRequest' objects). As mentioned earlier, constraints are applied only to requests
the AM makes via the new SchedulingRequest object.
When the Processor is enabled, constraints are assumed to be **hard**. That is, if the constraints
for a container cannot be satisfied, either due to conflicting constraints or the current
cluster / queue condition, those requests will be rejected by the Processor. Rejected requests
will be notified to the AM in the return of one of the subsequent allocate calls. The 'AllocateResponse'
has been modified to include a 'rejected_requests' field to facilitate this."




> Documentation for Placement Constraints
> ---------------------------------------
>
>                 Key: YARN-7780
>                 URL: https://issues.apache.org/jira/browse/YARN-7780
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Konstantinos Karanasos
>            Priority: Major
>         Attachments: YARN-7780-YARN-6592.001.patch, YARN-7780-YARN-6592.002.patch
>
>
> JIRA to track documentation for the feature.



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