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https://issues.apache.org/jira/browse/YARN-7921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375319#comment-16375319
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Weiwei Yang commented on YARN-7921:
-----------------------------------
Attached placement constraint expression syntax specification, [~kkaranasos],
please take a look. Also, please help to review this patch, thanks.
> Transform a PlacementConstraint to a string expression
> ------------------------------------------------------
>
> Key: YARN-7921
> URL: https://issues.apache.org/jira/browse/YARN-7921
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Priority: Major
> Attachments: Placement Constraint Expression Syntax
> Specification.pdf, YARN-7921.001.patch, YARN-7921.002.patch
>
>
> Purpose:
> Let placement constraint viewable on UI or log, e.g print app placement
> constraint in RM app page. Help user to use constraints and analysis
> placement issues easier.
> Propose:
> Like what was added for DS, toString is a reversed process of
> {{PlacementConstraintParser}} that transforms a PlacementConstraint to a
> string, using same syntax. E.g
> {code}
> AbstractConstraint constraintExpr = targetIn(NODE, allocationTag("hbase-m"));
> constraint.toString();
> // This prints: IN,NODE,hbase-m
> {code}
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