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[BugFix] Fix EngineConn uneven distribution with weighted random selection (#5322) - #5469

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zhang-arvin:fix/5322-weighted-node-selector
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[BugFix] Fix EngineConn uneven distribution with weighted random selection (#5322)#5469
zhang-arvin wants to merge 1 commit into
apache:masterfrom
zhang-arvin:fix/5322-weighted-node-selector

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What is the purpose of the change

Fix EngineConn uneven distribution by using weighted random selection instead of always picking the first node after rule filtering.

Brief change log

  • Modified DefaultNodeSelector to use weighted random selection based on node resource availability
  • Nodes with more remaining resources get higher probability of being selected
  • Ensures minimum weight of 1.0 to avoid zero-weight nodes being excluded

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