Horton

Add replication command READ_REPLICATION_SLOT

Michael Paquier <michael@paquier.xyz>

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Commit: b4ada4e19fd7bedb433e46516ccd0ca4213d2719
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-10-24T22:40:42Z
Releases: 15.0 
Add replication command READ_REPLICATION_SLOT

The command is supported for physical slots for now, and returns the
type of slot, its restart_lsn and its restart_tli.

This will be useful for an upcoming patch related to pg_receivewal, to
allow the tool to be able to stream from the position of a slot, rather
than the last WAL position flushed by the backend (as reported by
IDENTIFY_SYSTEM) if the archive directory is found as empty, which would
be an advantage in the case of switching to a different archive
locations with the same slot used to avoid holes in WAL segment
archives.

Author: Ronan Dunklau
Reviewed-by: Kyotaro Horiguchi, Michael Paquier, Bharath Rupireddy
Discussion: https://postgr.es/m/18708360.4lzOvYHigE@aivenronan

Files

PathChange+/−
doc/src/sgml/protocol.sgml modified +48 −0
src/backend/replication/repl_gram.y modified +15 −1
src/backend/replication/repl_scanner.l modified +1 −0
src/backend/replication/walsender.c modified +106 −0
src/include/nodes/nodes.h modified +1 −0
src/include/nodes/replnodes.h modified +11 −0
src/test/recovery/t/001_stream_rep.pl modified +31 −1
src/test/recovery/t/006_logical_decoding.pl modified +10 −1
src/tools/pgindent/typedefs.list modified +1 −0

Documentation touched

Discussion