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Posted to issues@hbase.apache.org by "Xiaolin Ha (Jira)" <ji...@apache.org> on 2021/04/12 06:59:00 UTC

[jira] [Created] (HBASE-25768) Support a overall simple and fast balance strategy for StochasticLoadBalancer

Xiaolin Ha created HBASE-25768:
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             Summary: Support a overall simple and fast balance strategy for StochasticLoadBalancer
                 Key: HBASE-25768
                 URL: https://issues.apache.org/jira/browse/HBASE-25768
             Project: HBase
          Issue Type: Improvement
          Components: Balancer
    Affects Versions: 1.4.13, 2.0.0, 3.0.0-alpha-1
            Reporter: Xiaolin Ha
            Assignee: Xiaolin Ha


When we use StochasticLoadBalancer + balanceByTable, we could face two difficulties.
 # For each table, their regions are distributed uniformly, but for the overall cluster, still exiting imbalance between RSes;
 # When there are large-scaled restart of RSes, or expansion for groups or cluster, we hope the balancer can execute as soon as possible, but the StochasticLoadBalancer may need a lot of time to compute costs.

We can detect these circumstances in StochasticLoadBalancer, and before the normal balance steps trying, we can add a strategy to let it just balance like the SimpleLoadBalancer or use few light cost functions here.

 

 



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