Weiwei Yang created YARN-7921:
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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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