Chris Lu 7eb90fdfd7 Enhance EC balancing to separate parity and data shards (#8038) ...

* Enhance EC balancing to separate parity and data shards across racks

* Rename avoidRacks to antiAffinityRacks for clarity

* Implement server-level EC separation for parity/data shards

* Optimize EC balancing: consolidate helpers and extract two-pass selection logic

* Add comprehensive edge case tests for EC balancing logic

* Apply code review feedback: rename select_(), add divide-by-zero guard, fix comment

* Remove unused parameters from doBalanceEcShardsWithinOneRack and add explicit anti-affinity check

* Add disk-level anti-affinity for data/parity shard separation

- Modified pickBestDiskOnNode to accept shardId and dataShardCount
- Implemented explicit anti-affinity: 1000-point penalty for placing data shards on disks with parity (and vice versa)
- Updated all call sites including balancing and evacuation
- For evacuation, disabled anti-affinity by passing dataShardCount=0

2026-01-15 12:43:44 -08:00

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