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https://issues.apache.org/jira/browse/HELIX-631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Subbu reopened HELIX-631:
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The bug is not fully fixed. It does not work for this combination, for example.
It assigns only 2 replicas for partition 9. I tested it with helix-0.6.7.
{code}
final String resourceName = "something";
final List<String> instanceNames = null; // Initialize to 6 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,
instanceNames, new HashMap<String, Map<String, String>>(0), new
ClusterDataCache());
{code}
> 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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