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From "Jiajun Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HELIX-674) Constraint Based Resource Rebalancer
Date Wed, 31 Jan 2018 23:34:00 GMT
Jiajun Wang created HELIX-674:
---------------------------------

             Summary: 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


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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