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Introduce replication slots.

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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
This commit is contained in:
Robert Haas
2014-01-31 22:45:17 -05:00
parent 5bdef38b89
commit 858ec11858
42 changed files with 2356 additions and 62 deletions
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4
src/backend/replication/basebackup.c
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@ -847,6 +847,10 @@ sendDir(char *path, int basepathlen, bool sizeonly, List *tablespaces)
if (strcmp(de->d_name, BACKUP_LABEL_FILE) == 0)
continue;
/* Skip pg_replslot, not useful to copy */
if (strcmp(de->d_name, "pg_replslot") == 0)
continue;
/*
* Check if the postmaster has signaled us to exit, and abort with an
* error in that case. The error handler further up will call