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Date: Tue, 9 Aug 2016 22:44:20 +0000 (UTC)
From: "Lei Xia (JIRA)" <jira@apache.org>
To: commits@helix.incubator.apache.org
Message-ID: <JIRA.12989601.1468535735000.266468.1470782660520@Atlassian.JIRA>
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Subject: [jira] [Assigned] (HELIX-631) AutoRebalanceStrategy does not work
 correctly all the time
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archived-at: Tue, 09 Aug 2016 22:51:16 -0000


     [ https://issues.apache.org/jira/browse/HELIX-631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lei Xia reassigned HELIX-631:
-----------------------------

    Assignee: Lei Xia

> 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: Lei Xia
>
> 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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