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From "Subbu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-631) AutoRebalanceStrategy does not work correctly all the time
Date Mon, 10 Apr 2017 20:48:41 GMT

    [ https://issues.apache.org/jira/browse/HELIX-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963470#comment-15963470
] 

Subbu commented on HELIX-631:
-----------------------------

Sorry I did not specify the test case fully.

Please try it with 16 partitions, 6 instances and 3 replicas.

You will see that partition 9 has only 2 replicas assigned to it


> 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
>            Assignee: Junkai Xue
>             Fix For: 0.6.6
>
>
> 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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