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https://issues.apache.org/jira/browse/HELIX-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15414352#comment-15414352
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Lei Xia commented on HELIX-631:
-------------------------------
Confirmed that this can be reproduced. The following preference list was
generated (with partition 9 missing one replica).
{0=[node-1, node-2, node-3],
1=[node-4, node-2, node-3],
10=[node-1, node-4, node-2],
11=[node-1, node-3, node-2],
12=[node-4, node-3, node-2],
13=[node-1, node-4, node-3],
14=[node-1, node-4, node-2],
15=[node-1, node-3, node-2],
2=[node-4, node-1, node-3],
3=[node-4, node-1, node-2],
4=[node-3, node-1, node-2],
5=[node-4, node-3, node-2],
6=[node-4, node-1, node-3],
7=[node-4, node-1, node-2],
8=[node-3, node-1, node-2],
9=[node-4, node-3]}
> 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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