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Add support TCP user timeout in libpq and the backend server

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Similarly to the set of parameters for keepalive, a connection parameter
for libpq is added as well as a backend GUC, called tcp_user_timeout.

Increasing the TCP user timeout is useful to allow a connection to
survive extended periods without end-to-end connection, and decreasing
it allows application to fail faster.  By default, the parameter is 0,
which makes the connection use the system default, and follows a logic
close to the keepalive parameters in its handling.  When connecting
through a Unix-socket domain, the parameters have no effect.

Author: Ryohei Nagaura
Reviewed-by: Fabien Coelho, Robert Haas, Kyotaro Horiguchi, Kirk
Jamison, Mikalai Keida, Takayuki Tsunakawa, Andrei Yahorau
Discussion: https://postgr.es/m/EDA4195584F5064680D8130B1CA91C45367328@G01JPEXMBYT04
This commit is contained in:
Michael Paquier
2019-04-06 15:23:37 +09:00
parent 959d00e9db
commit 249d649996
11 changed files with 198 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/backend/utils/misc/guc.c
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@ -182,9 +182,11 @@ static const char *show_archive_command(void);
static void assign_tcp_keepalives_idle(int newval, void *extra);
static void assign_tcp_keepalives_interval(int newval, void *extra);
static void assign_tcp_keepalives_count(int newval, void *extra);
static void assign_tcp_user_timeout(int newval, void *extra);
static const char *show_tcp_keepalives_idle(void);
static const char *show_tcp_keepalives_interval(void);
static const char *show_tcp_keepalives_count(void);
static const char *show_tcp_user_timeout(void);
static bool check_maxconnections(int *newval, void **extra, GucSource source);
static bool check_max_worker_processes(int *newval, void **extra, GucSource source);
static bool check_autovacuum_max_workers(int *newval, void **extra, GucSource source);
@ -530,6 +532,7 @@ char *application_name;
int tcp_keepalives_idle;
int tcp_keepalives_interval;
int tcp_keepalives_count;
int tcp_user_timeout;
/*
* SSL renegotiation was been removed in PostgreSQL 9.5, but we tolerate it
@ -3182,6 +3185,17 @@ static struct config_int ConfigureNamesInt[] =
NULL, NULL, NULL
},
{
{"tcp_user_timeout", PGC_USERSET, CLIENT_CONN_OTHER,
gettext_noop("TCP user timeout."),
gettext_noop("A value of 0 uses the system default."),
GUC_UNIT_MS
},
&tcp_user_timeout,
0, 0, INT_MAX,
NULL, assign_tcp_user_timeout, show_tcp_user_timeout
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL, NULL
@ -11238,6 +11252,23 @@ show_tcp_keepalives_count(void)
return nbuf;
}
static void
assign_tcp_user_timeout(int newval, void *extra)
{
/* See comments in assign_tcp_keepalives_idle */
(void) pq_settcpusertimeout(newval, MyProcPort);
}
static const char *
show_tcp_user_timeout(void)
{
/* See comments in assign_tcp_keepalives_idle */
static char nbuf[16];
snprintf(nbuf, sizeof(nbuf), "%d", pq_gettcpusertimeout(MyProcPort));
return nbuf;
}
static bool
check_maxconnections(int *newval, void **extra, GucSource source)
{