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8a45128106
1. Stricten MDEV-16091’s `rpl.rpl_seconds_behind_master_spike`
to prove that its fix covered MDEV-25999 as well
2. Add a Parallel Replication variant via a new `.combinations` file;
its current failure confirm MDEV-36840.
Because Parallel Replication queues Format Description Events as
position update metaevents, this variant uses a separate set of API-
compatible breakpoints to pause both the main and worker threads.
To support them, this commit replaces the MDEV-33327 patch c75905cacb
with a live-activation solution. In contrast, previous iterations queued
the activation pre-test and relied on other factors to enable the break.
Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com>
How to run. =========== ./mysql-test-run.pl --suite=rpl --mysqld=--binlog-format=mixed