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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-674) Constraint Based Resource Rebalancer
Date Fri, 09 Mar 2018 01:40:00 GMT

    [ https://issues.apache.org/jira/browse/HELIX-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392231#comment-16392231
] 

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

GitHub user jiajunwang opened a pull request:

    https://github.com/apache/helix/pull/145

    [HELIX-674] Introducing constraints based rebalancing mechanism.

    Constraint can be customized by application to restrict how rebalancing is processed.
    The change also includes examples to demonstrate how constraints can be defined and used.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jiajunwang/helix constraint

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/helix/pull/145.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #145
    
----
commit 195ca9818617e3909c8bf285912778b711edd67c
Author: jiajunwang <ericwang1985@...>
Date:   2018-02-27T01:21:48Z

    [HELIX-674] Introducing constraints based rebalancing mechanism.
    
    Constraint can be customized by application to restrict how rebalancing is processed.
    The change also includes examples to demonstrate how constraints can be defined and used.

----


> 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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