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Add functionality to "pause" repmgrd

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In some circumstances, e.g. while performing a switchover, it is essential
that repmgrd does not take any kind of failover action, as this will put
the cluster into an incorrect state.

Previously it was necessary to stop repmgrd on all nodes (or at least
those nodes which repmgrd would consider as promotion candidates), however
this is a cumbersome and potentially risk-prone operation, particularly if the
replication cluster contains more than a couple of servers.

To prevent this issue from occurring, this patch introduces the ability
to "pause" repmgrd on all nodes wth a single command ("repmgr daemon pause")
which notifies repmgrd not to take any failover action until the node
is "unpaused" ("repmgr daemon unpause").

"repmgr daemon status" provides an overview of each node and whether repmgrd
is running, and if so whether it is paused.

"repmgr standby switchover" has been modified to automatically pause repmgrd
while carrying out the switchover.

See documentation for further details.
This commit is contained in:
Ian Barwick
2018-09-27 16:42:10 +09:00
parent fce3c02760
commit 2491b8ae52
27 changed files with 1943 additions and 121 deletions
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20
dbutils.h
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@@ -327,6 +327,21 @@ typedef struct
UNKNOWN_TIMELINE_ID, \
InvalidXLogRecPtr \
}
typedef struct RepmgrdInfo {
int node_id;
int pid;
char pid_text[MAXLEN];
char pid_file[MAXLEN];
bool pg_running;
char pg_running_text[MAXLEN];
bool running;
char repmgrd_running[MAXLEN];
bool paused;
} RepmgrdInfo;
/* global variables */
extern int server_version_num;
@@ -399,6 +414,11 @@ bool identify_system(PGconn *repl_conn, t_system_identification *identification
bool repmgrd_set_local_node_id(PGconn *conn, int local_node_id);
int repmgrd_get_local_node_id(PGconn *conn);
BackupState server_in_exclusive_backup_mode(PGconn *conn);
void repmgrd_set_pid(PGconn *conn, pid_t repmgrd_pid, const char *pidfile);
pid_t repmgrd_get_pid(PGconn *conn);
bool repmgrd_is_running(PGconn *conn);
bool repmgrd_is_paused(PGconn *conn);
bool repmgrd_pause(PGconn *conn, bool pause);
/* extension functions */
ExtensionStatus get_repmgr_extension_status(PGconn *conn);