[jira] [Created] (HELIX-631) AutoRebalanceStrategy does not work correctly all the time

[Subbu (JIRA)]

Subbu created HELIX-631:
---------------------------

             Summary: AutoRebalanceStrategy does not work correctly all the time
                 Key: HELIX-631
                 URL: https://issues.apache.org/jira/browse/HELIX-631
             Project: Apache Helix
          Issue Type: Bug
            Reporter: Subbu


I have 16 partitions, 3 replicas each, and 4 instances to distribute these on. 
The auto-rebalancer assigns only 2 replicas for one of the partitions.

Here is the code snippet to reproduce the problem
{code}
    final String resourceName = "something";
    final List<String> instanceNames = null; // Initialize to 4 unique strings
    final int nReplicas = 3;

    List<String> partitions = new ArrayList<>(nPartitions);
    for (int i = 0; i < nPartitions; i++) {
      partitions.add(Integer.toString(i));
    }

    LinkedHashMap<String, Integer> states = new LinkedHashMap<>(2);
    states.put("OFFLINE", 0);
    states.put("ONLINE", nReplicas);

    AutoRebalanceStrategy strategy = new AutoRebalanceStrategy(resourceName, 
partitions, states);
    ZNRecord znRecord = strategy.computePartitionAssignment(instanceNames, new 
HashMap<String, Map<String, String>>(0), instanceNames);
{code}



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