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Added new criteria for slave selection: LEAST_ROUTER_CONNECTIONS which causes the servers having least connections from same router to become chosen.

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Added function pointer array which is indexed by enumerated selection criterias.
Selection criteria can now be switched by modifying config file and reloading it.
This commit is contained in:
VilhoRaatikka
2014-05-12 17:03:22 +03:00
parent 25cb08cc29
commit c5ec3cbc57
3 changed files with 122 additions and 48 deletions
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21
server/modules/include/readwritesplit.h
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@ -50,22 +50,33 @@ typedef enum rses_property_type_t {
RSES_PROP_TYPE_COUNT=RSES_PROP_TYPE_LAST+1
} rses_property_type_t;
/**
* This criteria is used when backends are chosen for a router session's use.
* Backend servers are sorted to ascending order according to the criteria
* and top N are chosen.
*/
typedef enum select_criteria {
UNDEFINED_CRITERIA=0,
LEAST_GLOBAL_CONNECTIONS,
LEAST_GLOBAL_CONNECTIONS, /*< all connections established by MaxScale */
DEFAULT_CRITERIA=LEAST_GLOBAL_CONNECTIONS,
LEAST_BEHIND_MASTER
LEAST_ROUTER_CONNECTIONS, /*< connections established by this router */
LEAST_BEHIND_MASTER,
LAST_CRITERIA /*< not used except for an index */
} select_criteria_t;
/** default values for rwsplit configuration parameters */
#define CONFIG_MAX_SLAVE_CONN 1
#define GET_SELECT_CRITERIA(s) \
#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))
strncmp(s,"LEAST_BEHIND_MASTER", strlen("LEAST_BEHIND_MASTER")) == 0 ? \
LEAST_BEHIND_MASTER : ( \
strncmp(s,"LEAST_ROUTER_CONNECTIONS", strlen("LEAST_ROUTER_CONNECTIONS")) == 0 ? \
LEAST_ROUTER_CONNECTIONS : UNDEFINED_CRITERIA)))
/**
* Session variable command