MDEV-38385 Galera test failure on MDEV-30418 #4635
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Fix for the sporadically failing MTR test "galera.MDEV-30418".
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Fix for the sporadically failing MTR test
galera.MDEV-30418.The test set incorrect values (on purpose) for
wsrep_cluster_addresssystem variable.Later in the test a correct value was restored, but there was a small time interval
after the restore during which WSREP would not allow any SELECT statements.
This caused the MTR test to fail sporadically.
Now the test waits with a SHOW statement for the WSREP to become ready for
for all SQL statements before proceeding.