How to use

removeEmptyKeys

method

in

org.apache.hadoop.yarn.api.protocolrecords.impl.pb.RegisterApplicationMasterRequestPBImpl

@Override
public void setPlacementConstraints(
  Map<Set<String>, PlacementConstraint> constraints) {
 maybeInitBuilder();
 if (constraints == null) {
  builder.clearPlacementConstraints();
 } else {
  removeEmptyKeys(constraints);
 }
 this.placementConstraints = constraints;
}