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That logic is needed to prevent picking a log of huge merges simultaneously (otherwise they will take all available slots and ClickHouse® will not be able to do smaller merges, which usually are important for keeping the number of parts stable).

It is normal to see those messages on some stale replicas. And it should be resolved automatically after some time. So just wait & monitor system.merges & system.replication_queue tables, it should be resolved by it’s own.

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I see messages like: source parts size (...) is greater than the current maximum (...) in the logs and/or inside system.replication_queue