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Improve pg_upgrade commentary on multixact change

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Per gripe from Andres Freund
This commit is contained in:
Alvaro Herrera
2013-02-28 16:29:17 -03:00
parent 63d283ecd0
commit cd7d00ad65
3 changed files with 12 additions and 8 deletions
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9
contrib/pg_upgrade/pg_upgrade.c
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@ -407,11 +407,10 @@ copy_clog_xlog_xid(void)
check_ok();
/*
* If both new and old are after the pg_multixact change commit, copy those
* files too. If the old server is before that change and the new server
* is after, then we don't copy anything but we need to reset pg_control so
* that the new server doesn't attempt to read multis older than the cutoff
* value.
* If the old server is before the MULTIXACT_FORMATCHANGE_CAT_VER change
* (see pg_upgrade.h) and the new server is after, then we don't copy
* pg_multixact files, but we need to reset pg_control so that the new
* server doesn't attempt to read multis older than the cutoff value.
*/
if (old_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER &&
new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)