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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-674) Constraint Based Resource Rebalancer
Date Tue, 20 Mar 2018 17:37:00 GMT

    [ https://issues.apache.org/jira/browse/HELIX-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16406748#comment-16406748
] 

ASF GitHub Bot commented on HELIX-674:
--------------------------------------

Github user lei-xia commented on a diff in the pull request:

    https://github.com/apache/helix/pull/145#discussion_r175833400
  
    --- Diff: helix-core/src/main/java/org/apache/helix/api/rebalancer/constraint/AbstractRebalanceSoftConstraint.java
---
    @@ -0,0 +1,56 @@
    +package org.apache.helix.api.rebalancer.constraint;
    +
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + */
    +
    +import org.apache.helix.controller.common.ResourcesStateMap;
    +
    +import java.util.Map;
    +
    +public abstract class AbstractRebalanceSoftConstraint {
    +  private static int DEFAULT_IMPORTANCE = 1;
    +  protected int _importance = DEFAULT_IMPORTANCE;
    +
    +  /**
    +   * Evaluate how the given assignment fits the constraint.
    +   * @param resource Target resource
    +   * @param proposedAssignment Map of <PartitionName, lists of possible ParticipantName>
    +   * @return Evaluation about the assignment. Larger number means better fit under this
constraint.
    +   */
    +  public abstract Map<String, int[]> evaluate(String resource,
    +      Map<String, String[]> proposedAssignment);
    +
    +  /**
    +   * @return The soft constraint's importance that will be used to compare with other
soft constraint results.
    +   * Aggregated evaluation score = SUM(constraint_evaluation * importance).
    +   */
    +  public int getConstraintImportance() {
    --- End diff --
    
    Is importance same as priority?


> 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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