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17e75f6b31
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.
34 lines
766 B
C
34 lines
766 B
C
/*
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* repmgrd.h
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* Copyright (c) 2ndQuadrant, 2010-2018
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*/
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#ifndef _REPMGRD_H_
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#define _REPMGRD_H_
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#include <time.h>
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#include "portability/instr_time.h"
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#define OPT_NO_PID_FILE 1000
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extern volatile sig_atomic_t got_SIGHUP;
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extern MonitoringState monitoring_state;
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extern instr_time degraded_monitoring_start;
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extern t_configuration_options config_file_options;
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extern t_node_info local_node_info;
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extern PGconn *local_conn;
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extern bool startup_event_logged;
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void try_reconnect(PGconn **conn, t_node_info *node_info);
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int calculate_elapsed(instr_time start_time);
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const char *print_monitoring_state(MonitoringState monitoring_state);
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void update_registration(PGconn *conn);
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void terminate(int retval);
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#endif /* _REPMGRD_H_ */
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