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wsrep_slave_threads change is not effective after node rejoins cluster #319
If wsrep_slave_threads count has been changed in a node, and node then drops from cluster and joins back, then changing the wsrep_slave_threads count will not be effective any more.
This is because the first invocation to change wsrep_slave_threads leaves a sticky counter in variables handling context, and this counter is not zeroed during node rejoining cluster.