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https://issues.apache.org/jira/browse/YARN-7921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16377548#comment-16377548
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Hudson commented on YARN-7921:
------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13717 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/13717/])
YARN-7921. Transform a PlacementConstraint to a string expression. (kkaranasos: 
rev e85188101c6c74b348a2fb6aa0f4e85c81b4a28c)
* (edit) 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/resource/PlacementConstraint.java
* (edit) 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/api/resource/TestPlacementConstraintTransformations.java
* (edit) 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/test/java/org/apache/hadoop/yarn/api/resource/TestPlacementConstraintParser.java


> 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
>             Fix For: 3.1.0
>
>         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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