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https://issues.apache.org/jira/browse/HBASE-10075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-10075.
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Resolution: Fixed
> add a locality-aware balancer
> -----------------------------
>
> Key: HBASE-10075
> URL: https://issues.apache.org/jira/browse/HBASE-10075
> Project: HBase
> Issue Type: New Feature
> Components: Balancer
> Affects Versions: 0.94.12
> Reporter: Chengxiang Li
> Priority: Major
>
> basic idea:
> during rebalance. For each region server, iterate regions, give each region a
> balance score, remove the lowest one until the region number of region server
> reach avg floor.
> during assignment. match to-be-assigned regions with each active region
> server as pairs, give each pair a balance score, the highest win this region.
> here is the mark formula:
> (1 – tableRegionNumberOnServer/allTableRegionNumber) * tableBalancerWeight
> + (1 – regionNumberOnServer/allRegionNumber) * serverBalancerWeight +
> regionBlockSizeOnServer/regionBlockSize * localityWeight
> + (previousServer?1:0) * stickinessWeight
> there are 4 factors which would influence the final balance score:
> 1. region balance
> 2. table region balance
> 3. region locality
> 4. region stickiness
> through adjust the weight of these 4 factors, we can balance the cluster in
> different strategy.
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