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Rationalize GetWalRcv{Write,Flush}RecPtr().

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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
This commit is contained in:
Thomas Munro
2020-04-08 23:45:09 +12:00
parent 83fd4532a7
commit d140f2f3e2
7 changed files with 55 additions and 28 deletions
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2
src/backend/access/transam/xlogfuncs.c
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@@ -398,7 +398,7 @@ pg_last_wal_receive_lsn(PG_FUNCTION_ARGS)
{
XLogRecPtr recptr;
recptr = GetWalRcvWriteRecPtr(NULL, NULL);
recptr = GetWalRcvFlushRecPtr(NULL, NULL);
if (recptr == 0)
PG_RETURN_NULL();