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MDEV#6206: wsrep_slave_threads subtracts from max_connections

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Decoupled wsrep thread count from connection count. By doing so,
the number of wsrep threads (applier/rollbacker) would no longer
affect the threads_connected status variable and thus maximum
allowable user connections limit would be @@max_connections.

Also introduced a new status variable 'wsrep_thread_count' to hold
the number of wsrep applier/rollbacker threads.

Added a test case.
This commit is contained in:
Nirbhay Choubey
2014-05-08 14:45:00 -04:00
parent 93a403bf1d
commit 00b6fff2e7
4 changed files with 124 additions and 7 deletions
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65
mysql-test/suite/wsrep/r/variables.result
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@ -11,4 +11,69 @@ SET SESSION wsrep_replicate_myisam= ON;
ERROR HY000: Variable 'wsrep_replicate_myisam' is a GLOBAL variable and should be set with SET GLOBAL
SET GLOBAL wsrep_replicate_myisam= ON;
SET GLOBAL wsrep_replicate_myisam= OFF;
#
# MDEV#6206: wsrep_slave_threads subtracts from max_connections
#
call mtr.add_suppression("safe_mutex: Found wrong usage of mutex 'LOCK_wsrep_slave_threads' and 'LOCK_global_system_variables'");
call mtr.add_suppression("WSREP: Failed to get provider options");
SELECT @@global.wsrep_provider;
@@global.wsrep_provider
none
SELECT @@global.wsrep_slave_threads;
@@global.wsrep_slave_threads
1
SELECT @@global.wsrep_cluster_address;
@@global.wsrep_cluster_address
SHOW STATUS LIKE 'threads_connected';
Variable_name Value
Threads_connected 1
SHOW STATUS LIKE 'wsrep_thread_count';
Variable_name Value
wsrep_thread_count 0
SET GLOBAL wsrep_provider= '/usr/lib/galera/libgalera_smm.so';
SELECT @@global.wsrep_provider;
@@global.wsrep_provider
/usr/lib/galera/libgalera_smm.so
SELECT @@global.wsrep_cluster_address;
@@global.wsrep_cluster_address
NULL
SHOW STATUS LIKE 'threads_connected';
Variable_name Value
Threads_connected 1
SHOW STATUS LIKE 'wsrep_thread_count';
Variable_name Value
wsrep_thread_count 0
# Setting wsrep_cluster_address triggers the creation of
# applier/rollbacker threads.
SET GLOBAL wsrep_cluster_address= 'gcomm://';
# Wait for applier threads to get created.
SELECT @@global.wsrep_provider;
@@global.wsrep_provider
/usr/lib/galera/libgalera_smm.so
SELECT @@global.wsrep_cluster_address;
@@global.wsrep_cluster_address
gcomm://
SHOW STATUS LIKE 'threads_connected';
Variable_name Value
Threads_connected 1
SHOW STATUS LIKE 'wsrep_thread_count';
Variable_name Value
wsrep_thread_count 2
SET @wsrep_slave_threads_saved= @@global.wsrep_slave_threads;
SET GLOBAL wsrep_slave_threads= 10;
# Wait for applier threads to get created.
SHOW STATUS LIKE 'threads_connected';
Variable_name Value
Threads_connected 1
SHOW STATUS LIKE 'wsrep_thread_count';
Variable_name Value
wsrep_thread_count 11
SET GLOBAL wsrep_slave_threads= @wsrep_slave_threads_saved;
SET GLOBAL wsrep_cluster_address= '';
SET GLOBAL wsrep_provider= 'none';
# End of test.