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Morph pg_replication_slots.min_safe_lsn to safe_wal_size

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The previous definition of the column was almost universally disliked,
so provide this updated definition which is more useful for monitoring
purposes: a large positive value is good, while zero or a negative value
means danger.  This should be operationally more convenient.

Backpatch to 13, where the new column to pg_replication_slots (and the
feature it represents) were added.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reported-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Discussion: https://postgr.es/m/9ddfbf8c-2f67-904d-44ed-cf8bc5916228@oss.nttdata.com
This commit is contained in:
Alvaro Herrera
2020-07-07 13:08:00 -04:00
parent 6a5c750f3f
commit a8aaa0c786
9 changed files with 62 additions and 36 deletions
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7
src/include/access/xlog_internal.h
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@@ -121,6 +121,13 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
#define XLByteToPrevSeg(xlrp, logSegNo, wal_segsz_bytes) \
logSegNo = ((xlrp) - 1) / (wal_segsz_bytes)
/*
* Convert values of GUCs measured in megabytes to equiv. segment count.
* Rounds down.
*/
#define XLogMBVarToSegs(mbvar, wal_segsz_bytes) \
((mbvar) / ((wal_segsz_bytes) / (1024 * 1024)))
/*
* Is an XLogRecPtr within a particular XLOG segment?
*