Automatically terminate replication connections that are idle for more

than replication_timeout (a new GUC) milliseconds. The TCP timeout is often
too long, you want the master to notice a dead connection much sooner.
People complained about that in 9.0 too, but with synchronous replication
it's even more important to notice dead connections promptly.

Fujii Masao and Heikki Linnakangas

src/backend/utils/misc/postgresql.conf.sample

@@ -200,6 +200,7 @@
 #wal_sender_delay = 1s		# walsender cycle time, 1-10000 milliseconds
 #wal_keep_segments = 0		# in logfile segments, 16MB each; 0 disables
 #vacuum_defer_cleanup_age = 0	# number of xacts by which cleanup is delayed
+#replication_timeout = 60s # in milliseconds, 0 is disabled
 
 # - Standby Servers -