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https://issues.apache.org/jira/browse/YARN-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332847#comment-16332847
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Arun Suresh commented on YARN-7774:
-----------------------------------
Updating patch
* Moved circular iterator to its own class
* The algorithm follows the scheme I mentioned in my previous comment. It will
try the last satisfied node before checking the next node in the iteration.
* Fixed the tests. The {{TestContinuousScheduling}} is unrelated and works fine
for me.
> Miscellaneous fixes to the PlacementProcessor
> ---------------------------------------------
>
> Key: YARN-7774
> URL: https://issues.apache.org/jira/browse/YARN-7774
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Priority: Blocker
> Attachments: YARN-7774-YARN-6592.001.patch,
> YARN-7774-YARN-6592.002.patch, YARN-7774-YARN-6592.003.patch,
> YARN-7774-YARN-6592.004.patch, YARN-7774-YARN-6592.005.patch
>
>
> JIRA to track the following minor changes:
> * Scheduler must normalize requests that are made using the
> {{attemptAllocationOnNode}} method.
> * Currently, the placement algorithm resets the node iterator for each
> request. The Placement Algorithm should either shuffle the node iterator OR
> use a circular iterator - to ensure a) more nodes are looked at and b) bias
> against placing too many containers on the same node
> * Add a placement retry loop for rejected requests - since there are cases
> especially, when Constraints will be satisfied after a subsequent request has
> been placed.
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