Jiajun Wang created HELIX-674:
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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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