From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: recovery_connections cannot start (was Re: master in standby mode croaks) |
Date: | 2010-04-23 20:11:38 |
Message-ID: | 15689.1272053498@sss.pgh.pa.us |
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Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Well, I think the real hole is that turning archive_mode=on results in
> WAL never being deleted unless it's successfully archived.
Hm, good point. And at least in principle you could have SR setups
that don't care about having a backing WAL archive.
> But we might be able to handle that like this:
> wal_mode={standby|archive|crash} # or whatever
> wal_segments_always=<integer> # keep this many segments always, for
> SR - like current wal_keep_segments
> wal_segments_unarchived=<integer> # keep this many unarchived
> segments, -1 for infinite
> max_wal_senders=<integer> # same as now
> archive_command=<string> # same as now
> So we always retain wal_segments_always segments, but if we have
> trouble with archiving we'll retain up to wal_segments_archived.
And when that limit is reached, what happens? Panic shutdown?
Silently drop unarchived data? Neither one sounds very good.
I think either you want your WAL archived or you don't. "Archive
if it's convenient" doesn't sound like a useful operating mode.
So maybe we do indeed need to keep archive_mode as a separate toggle.
regards, tom lane
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