Created by Vlad Lesin and last modified
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718. By Vlad Lesin

Gtid deployment port. The original code can be found here:

Add config option gtid_deployment_step useful for deployment


With gtid_deployment_step enabled, a host cannot generate gtids on its
own, but if gtid logged events are received through replication stream
from master, gtids will be logged.

Modified logic such that sql_thread never generates gtids automatically
on it's own. This diff is likely to be reverted when Oracle adds support
for gtid_mode=UPGRADE_STEP_1 & 2 which may be useful for deployment.

Test Plan:
Tested replication working with the
following scenarios.
1) Both Master and slave with gtid_deployment_step=0 and
2) Master with gtid_deployment_step=0 and gtid_mode=OFF, slave with
   gtid_deployment_step=1 and gtid_mode=ON.
3) Both master and slave with gtid_deployment_step=1 and gtid_mode=ON.
4) Master with gtid_deployment_step=0 and gtid_mode=ON, slave with
   gtid_deployment_step=1 and gtid_mode=ON.
5) Both master and slave with gtid_deployment_step=0 and gtid_mode=ON.

The difference between the original and ported codes:

1) Any code related to enable_gtid_mode_on_new_slave_with_old_master
system variable is removed as this variable absents in Percona Server.

2) gtid_deployment_step is dynamic variable now, the conditions of
changing the variable value are the same as for "read_only" variable
(see http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_read_only):
a) If you attempt to enable read_only while you have any explicit locks
(acquired with LOCK TABLES) or have a pending transaction, an error occurs.
b) If you attempt to enable read_only while other clients hold explicit table
locks or have pending transactions, the attempt blocks until the locks
are released and the transactions end. While the attempt to enable read_only
is pending, requests by other clients for table locks or to begin transactions
also block until read_only has been set.

715. By Laurynas Biveinis

Null-merge lp:percona-server/5.5 rev 722

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