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Added router_option slave_selection_criteria=[LEAST_GLOBAL_CONNECTIONS(default)|LEAST_BEHIND_MASTER] to readwritesplit section.

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The option is reloadable in the same way as max_slave_connections parameter. Option value determines which sort function is called before to sort backend server pointers before selecting them and establishing connections to backends.
This commit is contained in:
VilhoRaatikka
2014-05-11 23:59:16 +03:00
parent b8618ee7cf
commit b7ae1c1784
3 changed files with 106 additions and 34 deletions
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19
server/modules/include/readwritesplit.h
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@ -50,9 +50,23 @@ typedef enum rses_property_type_t {
RSES_PROP_TYPE_COUNT=RSES_PROP_TYPE_LAST+1
} rses_property_type_t;
typedef enum select_criteria {
UNDEFINED_CRITERIA=0,
LEAST_GLOBAL_CONNECTIONS,
DEFAULT_CRITERIA=LEAST_GLOBAL_CONNECTIONS,
LEAST_BEHIND_MASTER
} select_criteria_t;
/** default values for rwsplit configuration parameters */
#define CONFIG_MAX_SLAVE_CONN 1
#define GET_SELECT_CRITERIA(s) \
(strncmp(s,"LEAST_GLOBAL_CONNECTIONS", strlen("LEAST_GLOBAL_CONNECTIONS")) == 0 ? \
LEAST_GLOBAL_CONNECTIONS : ( \
strncmp(s,"LEAST_BEHIND_MASTER", strlen("LEAST_BEHIND_MASTER")) == 0 ? \
LEAST_BEHIND_MASTER : UNDEFINED_CRITERIA))
/**
* Session variable command
*/
@ -142,8 +156,9 @@ typedef struct backend_ref_st {
typedef struct rwsplit_config_st {
int rw_max_slave_conn_percent;
int rw_max_slave_conn_count;
int rw_max_slave_conn_percent;
int rw_max_slave_conn_count;
select_criteria_t rw_slave_select_criteria;
} rwsplit_config_t;