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| author | Robert Haas <rhaas@postgresql.org> | 2014-01-31 22:45:17 -0500 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2014-01-31 22:45:36 -0500 |
| commit | 858ec11858a914d4c380971985709b6d6b7dd6fc (patch) | |
| tree | 59eb508185cd8544c3485919a25dee15f3818c21 /src/backend/utils | |
| parent | 5bdef38b8917cfbe206d14969c61a5d38fc822b6 (diff) | |
| download | postgresql-858ec11858a914d4c380971985709b6d6b7dd6fc.tar.gz postgresql-858ec11858a914d4c380971985709b6d6b7dd6fc.zip | |
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
Diffstat (limited to 'src/backend/utils')
| -rw-r--r-- | src/backend/utils/misc/guc.c | 12 | ||||
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 3 |
2 files changed, 15 insertions, 0 deletions
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c index a9b9794965b..70d73d9898e 100644 --- a/src/backend/utils/misc/guc.c +++ b/src/backend/utils/misc/guc.c @@ -57,6 +57,7 @@ #include "postmaster/postmaster.h" #include "postmaster/syslogger.h" #include "postmaster/walwriter.h" +#include "replication/slot.h" #include "replication/syncrep.h" #include "replication/walreceiver.h" #include "replication/walsender.h" @@ -2124,6 +2125,17 @@ static struct config_int ConfigureNamesInt[] = }, { + /* see max_connections */ + {"max_replication_slots", PGC_POSTMASTER, REPLICATION_SENDING, + gettext_noop("Sets the maximum number of simultaneously defined replication slots."), + NULL + }, + &max_replication_slots, + 0, 0, MAX_BACKENDS /* XXX?*/, + NULL, NULL, NULL + }, + + { {"wal_sender_timeout", PGC_SIGHUP, REPLICATION_SENDING, gettext_noop("Sets the maximum time to wait for WAL replication."), NULL, diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index c8673b382da..d10e8a5783a 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -226,6 +226,9 @@ #wal_keep_segments = 0 # in logfile segments, 16MB each; 0 disables #wal_sender_timeout = 60s # in milliseconds; 0 disables +#max_replication_slots = 0 # max number of replication slots. + # (change requires restart) + # - Master Server - # These settings are ignored on a standby server. |