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Add "standby switchover" mode

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Perform a switchover by:
 - stopping current primary node
 - promoting this standby node to primary
 - forcing previous primary node to follow this node

Caveats:
 - repmgrd must not be running, otherwise it may
   attempt a failover
   (TODO: find some way of notifying repmgrd of planned
    activity like this)
 - currently only set up for two-node operation; any other
   standbys will probably become downstream cascaded standbys
   of the old primary once it's restarted
 - as we're executing repmgr remotely (on the old primary),
   we'll need the location of its configuration file; this
   can be provided explicitly with -C/--remote-config-file,
   otherwise repmgr will look in default locations on the
   remote server
 - this does not yet support "rewinding" stopped nodes
   which will be unable to catch up with the primary

TODO:
 - update help, docs
 - make connection test timeouts/intervals configurable
This commit is contained in:
Ian Barwick
2015-11-25 16:25:15 +09:00
parent f6d1db5edb
commit 120688013e
6 changed files with 1079 additions and 184 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
dbutils.h
View File

@@ -52,6 +52,18 @@ typedef struct s_node_info
} t_node_info;
/*
* Struct to store replication slot information
*/
typedef struct s_replication_slot
{
char slot_name[MAXLEN];
char slot_type[MAXLEN];
bool active;
} t_replication_slot;
#define T_NODE_INFO_INITIALIZER { \
NODE_NOT_FOUND, \
NO_UPSTREAM_NODE, \
@@ -86,7 +98,7 @@ int guc_set(PGconn *conn, const char *parameter, const char *op,
const char *value);
int guc_set_typed(PGconn *conn, const char *parameter, const char *op,
const char *value, const char *datatype);
bool get_conninfo_value(const char *conninfo, const char *keyword, char *output);
PGconn *get_upstream_connection(PGconn *standby_conn, char *cluster,
int node_id,
int *upstream_node_id_ptr,
@@ -99,15 +111,19 @@ bool cancel_query(PGconn *conn, int timeout);
char *get_repmgr_schema(void);
char *get_repmgr_schema_quoted(PGconn *conn);
bool create_replication_slot(PGconn *conn, char *slot_name);
int get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record);
bool drop_replication_slot(PGconn *conn, char *slot_name);
bool start_backup(PGconn *conn, char *first_wal_segment, bool fast_checkpoint);
bool stop_backup(PGconn *conn, char *last_wal_segment);
bool set_config_bool(PGconn *conn, const char *config_param, bool state);
bool copy_configuration(PGconn *masterconn, PGconn *witnessconn, char *cluster_name);
bool create_node_record(PGconn *conn, char *action, int node, char *type, int upstream_node, char *cluster_name, char *node_name, char *conninfo, int priority, char *slot_name);
bool delete_node_record(PGconn *conn, int node, char *action);
bool create_event_record(PGconn *conn, t_configuration_options *options, int node_id, char *event, bool successful, char *details);
int get_node_record(PGconn *conn, char *cluster, int node_id, t_node_info *node_info);
bool update_node_record_status(PGconn *conn, char *cluster_name, int this_node_id, char *type, int upstream_node_id, bool active);
bool update_node_record_set_upstream(PGconn *conn, char *cluster_name, int this_node_id, int new_upstream_node_id);
PGresult * get_node_record(PGconn *conn, char *cluster, int node_id);
bool create_event_record(PGconn *conn, t_configuration_options *options, int node_id, char *event, bool successful, char *details);
int get_node_replication_state(PGconn *conn, char *node_name, char *output);
t_server_type parse_node_type(const char *type);
#endif