Hi, Nirbhay! On Jun 08, Nirbhay Choubey wrote: > revision-id: 075233312cc5bc6c242f4629f8293d4c67937f02 > (mariadb-10.1.14-10-g0752333) > parent(s): c9f05974e618a869563f2360ef1ca910974a4f1c > author: Nirbhay Choubey > committer: Nirbhay Choubey > timestamp: 2016-06-08 16:03:01 -0400 > message: > > MDEV-10161: wsrep_sync_wait not enabled when set to 1 in config file > > Since wsrep_sync_wait & wsrep_causal_reads variables are related, > they are always kept in sync whenever one of them changes. > Same is tried on server start, where wsrep_sync_wait get updated > based on wsrep_causal_reads' value. But, since wsrep_causal_reads > is OFF by default, wsrep_sync_wait's value gets modified and loses > its WSREP_SYNC_WAIT_BEFORE_READ bit. > > Fixed by giving higher precedence to one that's explicitly set to > a non-default value and later to wsrep_sync_wait in case both are > set. > > diff --git a/sql/wsrep_mysqld.cc b/sql/wsrep_mysqld.cc > index d0798ef..fffb0cc 100644 > --- a/sql/wsrep_mysqld.cc > +++ b/sql/wsrep_mysqld.cc > @@ -567,7 +567,39 @@ int wsrep_init() > > wsrep_sst_auth_init(wsrep_sst_auth); > > - wsrep_causal_reads_update(&global_system_variables); > + /* > + On server start, there is no way to detect whether the default value > + for a system variable was set explicitly by the user. > + Now, since wsrep_causal_reads & wsrep_sync_wait are used for same > + purpose, a rule of precedence must be defined to keep their values > + in sync. It goes as following:
This is wrong. First, in 10.1 there is a way to detect whether the value was set by a user. I_S.SYSTEM_VARIABLES can show that. But even if you'd detected that, it won't help you do distinguish between mysqld --wsrep-sync-wait=1 --wsrep-causal-reads=0 mysqld --wsrep-sync-wait=0 --wsrep-causal-reads=1 The only correct solution is to handle this in the mysqld_get_one_option switch, updating the dependent option when one of these two is set. Regards, Sergei Chief Architect MariaDB and secur...@mariadb.org _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : maria-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
