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Chris Lu
6b6a268903
* volume balance: unify the per-move convergence guard Evaluate the post-move utilization comparison through serverUtilization so the guard also applies when servers lack MaxVolumeCount info (raw-count mode), where it previously did not run at all. * volume balance: restrict fallback destinations to improving servers The score-based fallback inside createBalanceTask could redirect a move to any valid server, including ones as full as the source — between equally full servers the move only relocates the imbalance and the next detection cycle reverses it (#11839). Exclude from eligibleTargets any server whose post-move utilization would exceed the source's, so a fallback destination satisfies the same convergence guard as the loop-chosen target. * volume balance: skip a volume when the chosen target violates placement When the detection loop's target resolves but cannot host the replica (it already holds one, or is out of the filtered scope), createBalanceTask now returns nil so the loop advances to the next volume — matching shell volume.balance, which continues to the next candidate instead of redirecting the move to a different server. The score-based fallback is kept for the case where the target cannot be resolved at all; its allowed set is already limited to servers the move would improve. * volume balance: regression test for replica-constrained targets (#11839) Reproduces the reported loop: the emptiest server holds the second rp=001 replica of the lowest-ID volumes on the fuller servers, so it is never a legal target for them. Detection must skip those volumes and send the movable ones to the under-utilized server, and re-running detection after applying the plan must never move the same volume twice.