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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7921) Transform a PlacementConstraint to a string expression
Date Sun, 11 Feb 2018 09:59:00 GMT
Weiwei Yang created YARN-7921:
---------------------------------

             Summary: 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


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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