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364b15c090
This patch fixes two problems that may arise when changing the value of wsrep_slave_threads: 1) Threads may be leaked if wsrep_slave_threads is changed repeatedly. Specifically, when changing the number of slave threads, we keep track of wsrep_slave_count_change, the number of slaves to start / stop. The problem arises when wsrep_slave_count_change is updated before slaves had a chance to exit (threads may take some time to exit, as they exit only after commiting one more replication event). The fix is to update wsrep_slave_count_change such that it reflects the number of threads that already exited or are scheduled to exit. 2) Attempting to set out of range value for wsrep_slave_threads (below 1 / above 512) results in wsrep_slave_count_change to be computed based on the out of range value, even though a warning is generated and wsrep_slave_threads is set to a truncated value. wsrep_slave_count_change is computed in wsrep_slave_threads_check(), which is called before mysql checks for valid range. Fix is to update wsrep_count_change whenever wsrep_slave_threads is updated with a valid value. |
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