HBASE-18164 Fast locality computation in balancer - addendum handles NaN
Signed-off-by: tedyu <yuzhihong@gmail.com> Signed-off-by: Sean Busbey <busbey@apache.org>
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@ -1286,8 +1286,9 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
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}
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// We normalize locality to be a score between 0 and 1.0 representing how good it
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// is compared to how good it could be
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locality /= bestLocality;
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// is compared to how good it could be. If bestLocality is 0, assume locality is 100
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// (and the cost is 0)
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locality = bestLocality == 0 ? 1.0 : locality / bestLocality;
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}
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@Override
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@ -1298,7 +1299,7 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
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return;
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}
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double localityDelta = getWeightedLocality(region, newEntity) - getWeightedLocality(region, oldEntity);
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double normalizedDelta = localityDelta / bestLocality;
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double normalizedDelta = bestLocality == 0 ? 0.0 : localityDelta / bestLocality;
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locality += normalizedDelta;
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}
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