branch-4.0: [fix](cloud) Prevent urgent load from preempting schema change lock #66082 - #66225
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branch-4.0: [fix](cloud) Prevent urgent load from preempting schema change lock #66082#66225github-actions[bot] wants to merge 1 commit into
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…66082) Related PR: #53086 Problem Summary: Urgent MOW load lock requests currently replace any existing delete bitmap update lock after the force-take threshold. If a heavy schema change owns the lock, the load can invalidate the schema change and make its later commit fail. This change keeps active schema change locks protected in both v1 and v2 lock implementations. Urgent loads continue to preempt compaction and load locks, and stale schema change locks still follow the existing expiration cleanup path. The unit-test matrix directly verifies persisted lock ownership and v2 job-key cleanup for active schema change, expired schema change, compaction, and ordinary load owners. An isolated cloud Docker case pauses schema change after lock acquisition, limits the urgent load to two immediate lock attempts, and verifies that the load fails with the lock conflict while schema change retains ownership. ### Release note Urgent MOW loads no longer preempt active schema change delete bitmap locks.
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Cherry-picked from #66082