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repmgrd: monitor standbys attached to primary

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This functionality enables repmgrd (when running on the primary) to
monitor connected child nodes. It will log connections and disconnections
and generate events.

Additionally, repmgrd can execute a custom script if the number of connected
child nodes falls below a configurable threshold. This script can be used
e.g. to "fence" the primary following a failover situation where a new primary
has been promoted and all standbys are now child nodes of that primary.
This commit is contained in:
Ian Barwick
2019-04-22 16:16:59 +09:00
parent 64c4cb81d5
commit 5a90513878
9 changed files with 917 additions and 5 deletions
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12
dbutils.h
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@@ -29,7 +29,7 @@
#include "strutil.h"
#include "voting.h"
#define REPMGR_NODES_COLUMNS "n.node_id, n.type, n.upstream_node_id, n.node_name, n.conninfo, n.repluser, n.slot_name, n.location, n.priority, n.active, n.config_file, '' AS upstream_node_name "
#define REPMGR_NODES_COLUMNS "n.node_id, n.type, n.upstream_node_id, n.node_name, n.conninfo, n.repluser, n.slot_name, n.location, n.priority, n.active, n.config_file, '' AS upstream_node_name, NULL AS attached "
#define BDR2_NODES_COLUMNS "node_sysid, node_timeline, node_dboid, node_name, node_local_dsn, ''"
#define BDR3_NODES_COLUMNS "ns.node_id, 0, 0, ns.node_name, ns.interface_connstr, ns.peer_state_name"
@@ -92,6 +92,13 @@ typedef enum
CONN_ERROR
} ConnectionStatus;
typedef enum
{
NODE_ATTACHED_UNKNOWN = -1,
NODE_DETACHED,
NODE_ATTACHED
} NodeAttached;
typedef enum
{
SLOT_UNKNOWN = -1,
@@ -152,7 +159,7 @@ typedef struct s_node_info
/* for ad-hoc use e.g. when working with a list of nodes */
char details[MAXLEN];
bool reachable;
bool attached;
NodeAttached attached;
/* various statistics */
int max_wal_senders;
int attached_wal_receivers;
@@ -429,6 +436,7 @@ int get_primary_node_id(PGconn *conn);
int get_ready_archive_files(PGconn *conn, const char *data_directory);
bool identify_system(PGconn *repl_conn, t_system_identification *identification);
TimeLineHistoryEntry *get_timeline_history(PGconn *repl_conn, TimeLineID tli);
bool get_child_nodes(PGconn *conn, int node_id, NodeInfoList *node_list);
/* repmgrd shared memory functions */
bool repmgrd_set_local_node_id(PGconn *conn, int local_node_id);