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Date: Sat, 22 Aug 2020 20:30:34 +0000
From: Eric Wong <e@yhbt.net>
To: Kyle Meyer <kyle@kyleam.com>
Cc: meta@public-inbox.org
Subject: Re: [PATCH 0/5] "mairix -t" workalike for mbox.gz downloads
Message-ID: <20200822203034.GA27004@dcvr>
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 <20200822064237.GA15720@dcvr>
 <874koucue1.fsf@kyleam.com>
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Kyle Meyer <kyle@kyleam.com> wrote:
> Eric Wong writes:
> > Eric Wong <e@yhbt.net> wrote:
> >> It requires "public-inbox-index --reindex" to activate;
> >> but PATCH 5/5 makes it safe to upgrade WWW either before
> >> or after --reindex.  That means BOFHs can upgrade without
> >> regard to ordering.
> >
> > public-inbox-watch users will need to restart -watch before
> > --reindex, though.  Don't think that's avoidable...
> 
> Oops, the few times I've used --reindex I don't think I've given order
> much thought.  Is it accurate to say that "restart services then
> --reindex" is the recommended order in general?

Not really.  In the distant past (pre-SCHEMA_VERSION=15), it was
actually index (no need for --reindex) then restart daemons,
because the daemons were running on SCHEMA_VERSION=14 (or
whatever was before).

This order is only needed since we're trying to stick to
SCHEMA_VERSION=15 to avoid the space penalty of parallel
versions.

If we get to SCHEMA_VERSION=16, it'll again be index first (no
need for --reindex), then restart -watch, then restart read-only
daemons.  Right now I don't see a need to do a
SCHEMA_VERSION=16.

However, there will very likely be an optional multi-inbox index
in 1.7 which will run parallel to existing (xap15) indices.
This multi-inbox index may be able to completely replace
existing indices (and save space while doing so).  But it'll
be completely optional.

In any case, the release notes will be updated with any
necessary upgrade instructions.