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https://issues.apache.org/jira/browse/HBASE-27389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-27389.
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Resolution: Fixed
Merged into the feature branch.
> Add cost function in balancer to consider the cost of building bucket cache
> before moving regions
> -------------------------------------------------------------------------------------------------
>
> Key: HBASE-27389
> URL: https://issues.apache.org/jira/browse/HBASE-27389
> Project: HBase
> Issue Type: Task
> Components: Balancer
> Reporter: Rahul Agarkar
> Assignee: Rahul Agarkar
> Priority: Major
>
> HBase currently uses StochasticLoadBalancer to determine the cost of moving
> the regions from one RS to another. Each cost functions give a result between
> 0 and 1, with 0 being the lowest cost and 1 being the cost. The balancer
> iterates through each cost function and comes up with the total cost. Now,
> the balancer will create multiple balancing plans on random actions and try
> to compute the cost of each plan as if they are executed, if the cost of the
> plan is less than the initial cost, the plan is executed.
> Implement a new "CacheAwareCostFunction" which takes into account if the
> region is fully cached and return the highest cost if the plan suggests
> moving this region.
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