Introduce replication slots.

Replication slots are a crash-safe data structure which can be created
on either a master or a standby to prevent premature removal of
write-ahead log segments needed by a standby, as well as (with
hot_standby_feedback=on) pruning of tuples whose removal would cause
replication conflicts.  Slots have some advantages over existing
techniques, as explained in the documentation.

In a few places, we refer to the type of replication slots introduced
by this patch as "physical" slots, because forthcoming patches for
logical decoding will also have slots, but with somewhat different
properties.

Andres Freund and Robert Haas

1 files changed, 5 insertions, 0 deletions

diff --git a/src/bin/pg_basebackup/pg_receivexlog.c b/src/bin/pg_basebackup/pg_receivexlog.c
index 3c6ab9a9024..8a702e33880 100644
--- a/src/bin/pg_basebackup/pg_receivexlog.c
+++ b/src/bin/pg_basebackup/pg_receivexlog.c
@@ -67,6 +67,7 @@ usage(void)
 	printf(_("  -U, --username=NAME    connect as specified database user\n"));
 	printf(_("  -w, --no-password      never prompt for password\n"));
 	printf(_("  -W, --password         force password prompt (should happen automatically)\n"));
+	printf(_("      --slot             replication slot to use\n"));
 	printf(_("\nReport bugs to <[email protected]>.\n"));
 }
 
@@ -343,6 +344,7 @@ main(int argc, char **argv)
 		{"no-password", no_argument, NULL, 'w'},
 		{"password", no_argument, NULL, 'W'},
 		{"status-interval", required_argument, NULL, 's'},
+		{"slot", required_argument, NULL, 'S'},
 		{"verbose", no_argument, NULL, 'v'},
 		{NULL, 0, NULL, 0}
 	};
@@ -409,6 +411,9 @@ main(int argc, char **argv)
 					exit(1);
 				}
 				break;
+			case 'S':
+				replication_slot = pg_strdup(optarg);
+				break;
 			case 'n':
 				noloop = 1;
 				break;