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https://issues.apache.org/jira/browse/HELIX-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397912#comment-16397912
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ASF GitHub Bot commented on HELIX-674:
--------------------------------------
Github user jiajunwang commented on a diff in the pull request:
https://github.com/apache/helix/pull/145#discussion_r174326382
--- Diff:
helix-core/src/main/java/org/apache/helix/util/WeightAwareRebalanceUtil.java ---
@@ -0,0 +1,141 @@
+package org.apache.helix.util;
+
+import org.apache.helix.HelixException;
+import org.apache.helix.ZNRecord;
+import org.apache.helix.api.config.RebalanceConfig;
+import
org.apache.helix.api.rebalancer.constraint.AbstractRebalanceHardConstraint;
+import
org.apache.helix.api.rebalancer.constraint.AbstractRebalanceSoftConstraint;
+import org.apache.helix.controller.common.PartitionStateMap;
+import org.apache.helix.controller.common.ResourcesStateMap;
+import
org.apache.helix.controller.rebalancer.strategy.ConstraintRebalanceStrategy;
+import org.apache.helix.controller.stages.ClusterDataCache;
+import org.apache.helix.model.*;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A rebalance tool that generate an resource partition assignment based
on the input.
+ * Note the assignment won't be automatically applied to the cluster.
Applications are supposed to
+ * apply the change.
+ */
--- End diff --
Good suggestion. Will add it.
> Constraint Based Resource Rebalancer
> ------------------------------------
>
> Key: HELIX-674
> URL: https://issues.apache.org/jira/browse/HELIX-674
> Project: Apache Helix
> Issue Type: New Feature
> Reporter: Jiajun Wang
> Assignee: Jiajun Wang
> Priority: Major
> Fix For: 0.8.x
>
> Attachments: Constraint-BasedResourceRebalancing-080318-2226-240.pdf
>
>
> Helix rebalancer assigns resources according to different strategies.
> Recently, we optimize the strategy for evenness and minimize movement.
> However, the evenness here only applies to partition numbers. Moreover, we've
> got more requests for customizable rebalancer from our users.
> Take partition weight as an example:
> In reality, partition replicas have different size. We use "partition weight"
> as an abstraction of the partition size. It can be network traffic usage,
> disk usage, or any other combined factors.
> Given each partition may have different weights, Helix should be able to
> assign partition accordingly. So that the distribution would be even
> regarding the weight.
> In this project, we are planning new rebalancer mechanism that generates
> resource partition assignment according to a list of "constraints". Current
> rebalance strategy can be regarded as one kind of constraint. Moving forward,
> Helix users would be able to extend the constraint interface using their own
> logic.
> Some init discussions are in progress and we will have a proposal posted here
> soon.
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