legedexinshi opened a new pull request #7199: Improve building SegmentsCostCache for CachingCostBalancerStrategy URL: https://github.com/apache/incubator-druid/pull/7199 In SegmentsCostCache.Bucket.Build, updating leftSum/rightSum for every addSegment/removeSegment method is expensive and needless. Moving the calculation of leftSum/rightSum to Build.build() helps accelerate building ClusterCostCache for CachingCostBalancerStrategy.
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