cuijianwei created HBASE-12928:
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Summary: BaseLoadBalancer#needsBalance only checks the sloppiness
of region count before balancing
Key: HBASE-12928
URL: https://issues.apache.org/jira/browse/HBASE-12928
Project: HBase
Issue Type: Improvement
Components: Balancer
Affects Versions: 0.99.2
Reporter: cuijianwei
Priority: Minor
BaseLoadBalancer#needsBalance will be invoked to judge whether needs to do
balancing. StochasticLoadBalancer do balancing by considering region count skew
cost, read/write request cost, locality cost, etc. However, it seems that only
sloppiness of region count is checked in BaseLoadBalancer#needsBalance, there
may be cases that request/locality cost is high when region count is even, this
will skip the actual balancing so that can't achieve lower cost. There, Do we
need to check sloppiness of other factors(read/write request, locality, etc) in
needsBalance?
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