[jira] [Created] (HELIX-563) Throw more meaningful exceptions when AutoRebalanceStrategy#computePartitionAssignment inputs are invalid

[Zhen Zhang (JIRA)]

Zhen Zhang created HELIX-563:
--------------------------------

             Summary: Throw more meaningful exceptions when 
AutoRebalanceStrategy#computePartitionAssignment inputs are invalid
                 Key: HELIX-563
                 URL: https://issues.apache.org/jira/browse/HELIX-563
             Project: Apache Helix
          Issue Type: Bug
            Reporter: Zhen Zhang


We hit the following NPE when the input for 
AutoRebalanceStrategy#computePartitionAssignment is invalid:

{noformat}
java.lang.NullPointerException
        at 
org.apache.helix.controller.strategy.AutoRebalanceStrategy$Node.access$300(AutoRebalanceStrategy.java:571)
        at 
org.apache.helix.controller.strategy.AutoRebalanceStrategy.computeExistingNonPreferredPlacement(AutoRebalanceStrategy.java:437)
        at 
org.apache.helix.controller.strategy.AutoRebalanceStrategy.computePartitionAssignment(AutoRebalanceStrategy.java:122)
...
{noformat}

The particular problem is curMapping.keySet() is not a subset of allPartitions 
in the following code snippet:

{noformat}
AutoRebalanceStrategy strategy = new AutoRebalanceStrategy(.., 
allPartitions,...)
strategy.computePartitionAssignment(..., curMapping, ...)
{noformat}





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