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[server] Store rebalance tasks in remote storage - #5133
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Persist large rebalance tasks in immutable remote files referenced by versioned ZooKeeper handles, while retaining the inline format until every live coordinator advertises support. Load recovery asynchronously and move task persistence off the coordinator event thread. Retry recovery failures with capped exponential backoff and preserve cancellation correctness across asynchronous persistence. Verify ambiguous ZooKeeper writes from committed state and fence list and cancel requests while a new task is being persisted. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-5 AI-Contributed/Feature: 44/44 AI-Contributed/UT: 57/57
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Purpose
Linked issue: close #3868
A rebalance task contains the complete bucket migration plan. As clusters grow, the serialized task can approach ZooKeeper's znode size limit, which may cause persistence or coordinator recovery to fail.
Loading a large rebalance task synchronously during coordinator initialization would also make coordinator startup depend on remote storage latency and availability.
This PR stores large rebalance tasks in remote storage while keeping ZooKeeper as the authoritative pointer. It also moves rebalance recovery out of the synchronous coordinator startup path.
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