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repmgrd: improve reconnection handling

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Previously, if the server being monitored was not available, repmgrd
would always close the existing connection handle and open a new one.

However, in some cases, e.g. a brief network outage, the existing
connection handle is still good and does not need to be reopened.

This could be particularly problematic if monitoring_history is on,
as this risks leaving orphan sessions on the primary which (given
a sufficiently unstable network) could lead to all available backends
being occupied.

Instead, during an outage we now use a new connection to verify
the server is accessible; if the old connection is still available
(e.g. following a short network interruption) we continue using that;
if  not (e.g. the server was restarted), we use the new one.
This commit is contained in:
Ian Barwick
2018-08-30 10:24:06 +09:00
parent 3b8586d82a
commit 17e75f6b31
8 changed files with 59 additions and 25 deletions
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repmgrd.h
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@@ -21,7 +21,7 @@ extern t_node_info local_node_info;
extern PGconn *local_conn;
extern bool startup_event_logged;
PGconn *try_reconnect(t_node_info *node_info);
void try_reconnect(PGconn **conn, t_node_info *node_info);
int calculate_elapsed(instr_time start_time);
const char *print_monitoring_state(MonitoringState monitoring_state);