[jira] [Created] (YARN-7681) Scheduler should double-check placement constraint before actual allocation is made

["Weiwei Yang (JIRA)" <ji...@apache.org>]

Weiwei Yang created YARN-7681:
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             Summary: Scheduler should double-check placement constraint before actual allocation is made
                 Key: YARN-7681
                 URL: https://issues.apache.org/jira/browse/YARN-7681
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: RM, scheduler
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


This JIRA is created based on the discussions under YARN-7612, see comments after [this comment|https://issues.apache.org/jira/browse/YARN-7612?focusedCommentId=16303051&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16303051]. AllocationTagsManager maintains tags info that helps to make placement decisions at placement phase, however tags are changing along with container's lifecycle, so it is possible that the placement violates the constraints at the scheduling phase. Propose to add an extra check in the scheduler to make sure constraints are still satisfied during the actual allocation.



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