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MXS-199: Support Causal Read in Read Write Splitting (#164)

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* MXS-199: Support Causal Read in Read Write Splitting

* move most causal read logic into rwsplit router and get server type from monitor

* misc fix: remove new line

* refactor, move config to right place, replace ltrim with gwbuf_consume

* refacter a little for previous commit

* fix code style
This commit is contained in:
dapeng
2018-02-05 15:09:18 +08:00
committed by Johan Wikman
parent 0696f3f60a
commit 8a0c8e63f2
9 changed files with 222 additions and 3 deletions
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16
server/modules/routing/readwritesplit/readwritesplit.hh
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@ -145,6 +145,12 @@ enum ld_state
#define BACKEND_TYPE(b) (SERVER_IS_MASTER((b)->backend_server) ? BE_MASTER : \
(SERVER_IS_SLAVE((b)->backend_server) ? BE_SLAVE : BE_UNDEFINED));
#define MARIADB_WAIT_GTID_FUNC "MASTER_GTID_WAIT"
#define MYSQL_WAIT_GTID_FUNC "WAIT_FOR_EXECUTED_GTID_SET"
static const char gtid_wait_stmt[] =
"SET @maxscale_secret_variable=(SELECT CASE WHEN %s('%s', %s) = 0 "
"THEN 1 ELSE (SELECT 1 FROM INFORMATION_SCHEMA.ENGINES) END);";
struct Config
{
Config(MXS_CONFIG_PARAMETER* params):
@ -166,8 +172,14 @@ struct Config
connection_keepalive(config_get_integer(params, "connection_keepalive")),
max_slave_replication_lag(config_get_integer(params, "max_slave_replication_lag")),
rw_max_slave_conn_percent(0),
max_slave_connections(0)
max_slave_connections(0),
enable_causal_read(config_get_bool(params, "enable_causal_read")),
causal_read_timeout(config_get_string(params, "causal_read_timeout"))
{
if (enable_causal_read)
{
retry_failed_reads = true;
}
}
select_criteria_t slave_selection_criteria; /**< The slave selection criteria */
@ -187,6 +199,8 @@ struct Config
int rw_max_slave_conn_percent; /**< Maximum percentage of slaves to use for
* each connection*/
int max_slave_connections; /**< Maximum number of slaves for each connection*/
bool enable_causal_read; /**< Enable causual read */
std::string causal_read_timeout; /**< Timetout, second parameter of function master_wait_gtid */
};