Horton

Rationalize GetWalRcv{Write,Flush}RecPtr().

Thomas Munro <tmunro@postgresql.org>

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Commit: d140f2f3e225ea53e2d92ab6833b8c186c90666c
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-04-08T11:45:09Z
Releases: 13.0 
Rationalize GetWalRcv{Write,Flush}RecPtr().

GetWalRcvWriteRecPtr() previously reported the latest *flushed*
location.  Adopt the conventional terminology used elsewhere in the tree
by renaming it to GetWalRcvFlushRecPtr(), and likewise for some related
variables that used the term "received".

Add a new definition of GetWalRcvWriteRecPtr(), which returns the latest
*written* value.  This will allow later patches to use the value for
non-data-integrity purposes, without having to wait for the flush
pointer to advance.

Reviewed-by: Alvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA%2BhUKGJ4VJN8ttxScUFM8dOKX0BrBiboo5uz1cq%3DAovOddfHpA%40mail.gmail.com

Files

PathChange+/−
src/backend/access/transam/xlog.c modified +10 −10
src/backend/access/transam/xlogfuncs.c modified +1 −1
src/backend/replication/README modified +1 −1
src/backend/replication/walreceiver.c modified +10 −5
src/backend/replication/walreceiverfuncs.c modified +18 −6
src/backend/replication/walsender.c modified +1 −1
src/include/replication/walreceiver.h modified +14 −4

Discussion