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doc: add note about switchover and exclusive backups

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Also rename server_not_in_exclusive_backup_mode() to avoid double
negatives.

GitHub #476.
This commit is contained in:
Ian Barwick
2018-07-19 15:58:33 +09:00
parent 8f13a66aaa
commit 7ecfb333b9
7 changed files with 71 additions and 33 deletions
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57
dbutils.c
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@@ -1601,6 +1601,39 @@ repmgrd_get_local_node_id(PGconn *conn)
}
/*
* Function that checks if the primary is in exclusive backup mode.
* We'll use this when executing an action can conflict with an exclusive
* backup.
*/
BackupState
server_in_exclusive_backup_mode(PGconn *conn)
{
BackupState backup_state = BACKUP_STATE_UNKNOWN;
PGresult *res = PQexec(conn, "SELECT pg_catalog.pg_is_in_backup()");
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to retrieve information regarding backup mode of node"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return BACKUP_STATE_UNKNOWN;
}
if (atobool(PQgetvalue(res, 0, 0)) == true)
{
backup_state = BACKUP_STATE_IN_BACKUP;
}
else
{
backup_state = BACKUP_STATE_NO_BACKUP;
}
PQclear(res);
return backup_state;
}
/* ================ */
/* result functions */
@@ -3953,31 +3986,7 @@ connection_ping(PGconn *conn)
return;
}
/*
* Function that checks if the primary is in exclusive backup mode.
* We'll use this when executing an action can conflict with an exclusive
* backup.
*/
bool
server_not_in_exclusive_backup_mode(PGconn *conn)
{
PGresult *res = PQexec(conn, "SELECT pg_is_in_backup()");
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to retrieve information regarding backup mode of node"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return false;
}
if (strcmp(PQgetvalue(res, 0, 0), "t") == 0)
{
log_warning(_("node is in exclusive backup mode"));
return false;
}
return true;
}
/* ==================== */
/* monitoring functions */