nijel created YARN-3018:

             Summary: Unify the default value for 
yarn.scheduler.capacity.node-locality-delay in code and default xml file
                 Key: YARN-3018
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
            Reporter: nijel
            Priority: Trivial

For the configuration item "yarn.scheduler.capacity.node-locality-delay" the 
default value given in code is "-1"

public static final int DEFAULT_NODE_LOCALITY_DELAY = -1;

In the default capacity-scheduler.xml file in the resource manager config 
directory it is 40.

Can it be unified to avoid confusion when the user creates the file without 
this configuration. IF he expects the values in the file to be default values, 
then it will be wrong.

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