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https://issues.apache.org/jira/browse/HELIX-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963368#comment-15963368
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Junkai Xue commented on HELIX-631:
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Hi [~mcvsubbu],
I just use your code tested it. But I one thing you forgot to add is the
instance names:
for (int i = 0; i < 6; i++) {
instanceNames.add("NODE_" + i);
}
With this additional code, I got generated mapping:
something, {}{0={NODE_0=ONLINE, NODE_4=ONLINE, NODE_5=ONLINE},
1={NODE_0=ONLINE, NODE_1=ONLINE, NODE_5=ONLINE}, 2={NODE_0=ONLINE,
NODE_1=ONLINE, NODE_2=ONLINE}, 3={NODE_1=ONLINE, NODE_2=ONLINE, NODE_3=ONLINE},
4={NODE_2=ONLINE, NODE_3=ONLINE, NODE_4=ONLINE}}{0=[NODE_0, NODE_4, NODE_5],
1=[NODE_1, NODE_0, NODE_5], 2=[NODE_2, NODE_1, NODE_0], 3=[NODE_3, NODE_2,
NODE_1], 4=[NODE_3, NODE_4, NODE_2]}
I did not see any problem with this case. Could you please provide more details
about 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: Lei Xia
> 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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