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Posted to yarn-dev@hadoop.apache.org by "Weiwei Yang (JIRA)" <ji...@apache.org> on 2018/02/11 09:59:00 UTC
[jira] [Created] (YARN-7921) Transform a PlacementConstraint to a
string expression
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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