wsrep_slave_threads can be set without a warning or error

Bug #978971 reported by shinguz
8
This bug affects 1 person
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MySQL patches by Codership
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Bug Description

When I set

SET GLOBAL wsrep_slave_threads = n;

It is accepted by mysql and even reflected by show global variables. But I have learned that it is only taken into account after reload of provider which means in practice: restart the database.

which means in practice: this variable cannot be set-online.

Erkules and I have the opinion, that this is NOT expected behavior and should through at least a warning or better be prohibited at all...

Revision history for this message
Alex Yurchenko (ayurchen) wrote :

Related to https://bugs.launchpad.net/codership-mysql/+bug/852094

Oli,
Provider relaoding is not equivalent to restarting the database since you keep yer buffer pool and is a much faster operation. So it is not absolutely obvious that it should be made a read-only variable.

Revision history for this message
Philip Stoev (philip-stoev-f) wrote :

In my experiments wsrep_slave_threads = N takes effect immediately and the new threads are shown in SHOW PROCESSLIST. No reloading or restarting is required.

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