[server] Support configurable rebalance concurrency#3537
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Purpose
Linked issue: close #3536
Add
coordinator.rebalance.max-inflight-tasksto control how manybucket-level rebalance tasks can run concurrently. The option is
dynamically reconfigurable, and
setting it to 0 pauses schedulingnewrebalance tasks while allowing already in-flight tasks to complete or
time out.
Route dynamic rebalance concurrency changes, startup recovery, and
timeout handling through coordinator events so rebalance task submission
and state transitions stay on the coordinator event thread.
Brief change log
Tests
API and Format
Documentation