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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