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Replace XLogRecPtr struct with a 64-bit integer.

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This simplifies code that needs to do arithmetic on XLogRecPtrs.

To avoid changing on-disk format of data pages, the LSN on data pages is
still stored in the old format. That should keep pg_upgrade happy. However,
we have XLogRecPtrs embedded in the control file, and in the structs that
are sent over the replication protocol, so this changes breaks compatibility
of pg_basebackup and server. I didn't do anything about this in this patch,
per discussion on -hackers, the right thing to do would to be to change the
replication protocol to be architecture-independent, so that you could use
a newer version of pg_receivexlog, for example, against an older server
version.
This commit is contained in:
Heikki Linnakangas
2012-06-24 18:51:37 +03:00
parent 061e7efb1b
commit 0ab9d1c4b3
28 changed files with 279 additions and 357 deletions
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3
src/backend/access/transam/transam.c
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@@ -24,9 +24,6 @@
#include "access/transam.h"
#include "utils/snapmgr.h"
/* Handy constant for an invalid xlog recptr */
const XLogRecPtr InvalidXLogRecPtr = {0, 0};
/*
* Single-item cache for results of TransactionLogFetch. It's worth having
* such a cache because we frequently find ourselves repeatedly checking the