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Commit0e141c0fbbintroduced a new facility to reduce ProcArrayLock contention by clearing several XIDs from the ProcArray under a single lock acquisition. The names initially chosen were deemed not to be very good choices, so commit4aec49899erenamed them. But now it seems like we still didn't get it right. A pending patch wants to add similar infrastructure for batching CLOG updates, so the names need to be clear enough to allow a new set of structure members with a related purpose. Amit Kapila