ParadoxV5 f7ba16980d MDEV-36840 Seconds_Behind_Master Spike at Log Rotation on Parallel Replica ...

`Seconds_Behind_Master` unsets from 0 when a
parallel replica processes an internal event.

Est. 8dad51481b of MDEV-10653, the idle status of the worker
threads directly checks the emptiness of the workers’ queue.
The problem is that the queue could be entirely
internal events that don’t record replicated content.

In contrast, the (main) SQL thread (in both serial and parallel
replicas) uses a state boolean `sql_thread_caught_up` that is
not unset if the event is internal. Therefore, this patch adds
a workers’ equivalent, `worker_threads_caught_up`, that
matches the behaviour of that for the (main) SQL thread.

Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com>
Acked-by: Kristian Nielsen <knielsen@knielsen-hq.org>

2025-07-07 14:03:49 -06:00

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