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915983e1cc
This patch makes the following changes around variable wsrep_on:
1) Variable wsrep_on can no longer be updated from a session that has
an active transaction running. The original behavior allowed cases
like this:
BEGIN;
INSERT INTO t1 VALUES (1);
SET SESSION wsrep_on = OFF;
INSERT INTO t1 VALUES (2);
COMMIT;
With regular transactions this would result in no replication
events (not even value 1). With streaming replication it would be
unnecessarily complex to achieve the same behavior. In the above
example, it would be possible for value 1 to be already replicated if
it happened to fill a separate fragment, while value 2 wouldn't.
2) Global variable wsrep_on no longer affects current sessions, only
subsequent ones. This is to avoid a similar case to the above, just
using just by using global wsrep_on instead session wsrep_on:
--connection conn_1
BEGIN;
INSERT INTO t1 VALUES(1);
--connection conn_2
SET GLOBAL wsrep_on = OFF;
--connection conn_1
INSERT INTO t1 VALUES(2);
COMMIT;
The above example results in the transaction to be replicated, as
global wsrep_on will only affect the session wsrep_on of new
connections.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>
113 lines
4 KiB
C++
113 lines
4 KiB
C++
/* Copyright (C) 2013 Codership Oy <info@codership.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. */
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#ifndef WSREP_VAR_H
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#define WSREP_VAR_H
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#include <my_config.h>
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#ifdef WITH_WSREP
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#define WSREP_CLUSTER_NAME "my_wsrep_cluster"
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#define WSREP_NODE_INCOMING_AUTO "AUTO"
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#define WSREP_START_POSITION_ZERO "00000000-0000-0000-0000-000000000000:-1"
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// MySQL variables funcs
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#include "sql_priv.h"
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#include <sql_plugin.h>
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#include <mysql/plugin.h>
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class sys_var;
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class set_var;
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class THD;
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int wsrep_init_vars();
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void wsrep_set_wsrep_on();
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#define CHECK_ARGS (sys_var *self, THD* thd, set_var *var)
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#define UPDATE_ARGS (sys_var *self, THD* thd, enum_var_type type)
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#define DEFAULT_ARGS (THD* thd, enum_var_type var_type)
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#define INIT_ARGS (const char* opt)
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extern bool wsrep_causal_reads_update UPDATE_ARGS;
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extern bool wsrep_on_check CHECK_ARGS;
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extern bool wsrep_on_update UPDATE_ARGS;
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extern bool wsrep_sync_wait_update UPDATE_ARGS;
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extern bool wsrep_start_position_check CHECK_ARGS;
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extern bool wsrep_start_position_update UPDATE_ARGS;
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extern bool wsrep_start_position_init INIT_ARGS;
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extern bool wsrep_provider_check CHECK_ARGS;
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extern bool wsrep_provider_update UPDATE_ARGS;
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extern void wsrep_provider_init INIT_ARGS;
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extern bool wsrep_provider_options_check CHECK_ARGS;
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extern bool wsrep_provider_options_update UPDATE_ARGS;
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extern void wsrep_provider_options_init INIT_ARGS;
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extern bool wsrep_cluster_address_check CHECK_ARGS;
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extern bool wsrep_cluster_address_update UPDATE_ARGS;
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extern void wsrep_cluster_address_init INIT_ARGS;
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extern bool wsrep_cluster_name_check CHECK_ARGS;
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extern bool wsrep_cluster_name_update UPDATE_ARGS;
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extern bool wsrep_node_name_check CHECK_ARGS;
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extern bool wsrep_node_name_update UPDATE_ARGS;
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extern bool wsrep_node_address_check CHECK_ARGS;
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extern bool wsrep_node_address_update UPDATE_ARGS;
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extern void wsrep_node_address_init INIT_ARGS;
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extern bool wsrep_sst_method_check CHECK_ARGS;
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extern bool wsrep_sst_method_update UPDATE_ARGS;
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extern void wsrep_sst_method_init INIT_ARGS;
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extern bool wsrep_sst_receive_address_check CHECK_ARGS;
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extern bool wsrep_sst_receive_address_update UPDATE_ARGS;
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extern bool wsrep_sst_auth_check CHECK_ARGS;
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extern bool wsrep_sst_auth_update UPDATE_ARGS;
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extern bool wsrep_sst_donor_check CHECK_ARGS;
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extern bool wsrep_sst_donor_update UPDATE_ARGS;
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extern bool wsrep_slave_threads_check CHECK_ARGS;
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extern bool wsrep_slave_threads_update UPDATE_ARGS;
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extern bool wsrep_desync_check CHECK_ARGS;
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extern bool wsrep_desync_update UPDATE_ARGS;
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extern bool wsrep_trx_fragment_size_check CHECK_ARGS;
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extern bool wsrep_trx_fragment_size_update UPDATE_ARGS;
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extern bool wsrep_trx_fragment_unit_update UPDATE_ARGS;
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extern bool wsrep_max_ws_size_check CHECK_ARGS;
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extern bool wsrep_max_ws_size_update UPDATE_ARGS;
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extern bool wsrep_reject_queries_update UPDATE_ARGS;
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extern bool wsrep_debug_update UPDATE_ARGS;
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#else /* WITH_WSREP */
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#define wsrep_provider_init(X)
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#define wsrep_init_vars() (0)
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#define wsrep_start_position_init(X)
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#endif /* WITH_WSREP */
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#endif /* WSREP_VAR_H */
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