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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