Youzan Coder
Mar 6, 2019 · Big Data
Analysis of Druid's Balance Strategy and Cost Computation
The article examines Druid’s cost‑based balance strategy introduced in version 0.12.0, explaining how the ‘cost’ algorithm randomly selects a segment, computes a pairwise exponential cost for each Historical node using a closed‑form integral, and moves the segment to the node with minimal cost to improve query parallelism.
Balance StrategyDruidJava
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