(improvement)Optimize DCAware/RackAware/TokenAware/HostFilter policies with host distance caching and overall perf. improvements#651

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mykaul wants to merge 10 commits intoscylladb:masterfrom

mykaul:query_plan_opt_2

Commits on Mar 12, 2026

(improvement)Optimize DCAwareRoundRobinPolicy by removing redundant state
mykaul
committed
(improvement)Optimize RackAwareRoundRobinPolicy by caching some host distances
mykaul
committed
(improvement)TokenAware round robin policy and others - improved query planning.
mykaul
committed
(improvement) Further optimize load-balancing query plans and tests
mykaul
committed
(improvement) additional improvements to HostFilter and default policy.
mykaul
committed
(improvement) Cache token-to-replicas lookup in TokenAwarePolicy
mykaul
committed
(improvement) LWT no-shuffle shortcut with determinism tests
mykaul
committed

Commits on Mar 16, 2026

Commits on Mar 20, 2026

fix: replace tautological assertion with exclusion-set verification
mykaul
committed