Lost updates to Notmuch database
Eric J
eric at deptj.eu
Thu Feb 18 13:26:56 PST 2016
On Thu, 18 Feb 2016 16:30:34 +0200, Tomi Ollila <tomi.ollila at iki.fi> wrote:
> On Thu, Feb 18 2016, David Bremner <david at tethera.net> wrote:
>
> > Eric J <eric at deptj.eu> writes:
> >
> >> However, if I do it twice, in different processes, at the same time, one
> >> file is added and tagged properly, the other is not (totally unfindable
> >> by notmuch search). Neither process reports any error, and they both log
> >> their actions normally. Actually a third simultaneous process also fails
> >> to leave any result in the database.
> >
> > It should be impossible for more than one process to open a Xapian
> > database for writing at the same time. So if the processes are really
> > running in parallel, you should be getting error codes from the later
> > calls to notmuch_database_open{_verbose}. You claim that's not
> > happening, which is puzzling. Maybe you can try to duplicate your
> > problem with a tiny C program.
>
> In addition to that (or even before), you could
>
> 1) be able to reproduce the problem
As I said in my response to David, I can do just the open, and see that
there is no lock, and do the same open in another session without error.
> 2) try to reproduce it prefixing the command with ltrace -tt
Well, as you say below, no Xapian references. Even worse, ltracing the
Tcl version sees no Notmuch references either.
> 3) examine carefully the ltrace logs to figure out where the proble lies
So all I can see is that the notmuch_database_open from notmuch new
looks just like I think mine would look - if I could see it.
(Adding -S to ltrace was not particularly informative either.)
> Tomi
>
> Hmm, Interestingly when I run
>
> LD_LIBRARY_PATH=~/vc/ext/notmuch/lib ltrace -f -tt ~/vc/ext/notmuch/notmuch-shared new
>
> I did not see any Xapian references, but when I did
>
> ltrace -f -tt ~/vc/ext/notmuch/notmuch new
>
> I did. Interestingly when using libnotmuch.so.4 the xapian interface
> is hidden (is it baked inside ~/vc/ext/notmuch/lib/libnotmuch.so.4.3.0 :O)
My latest piece of evidence suggests that this may not be a Notmuch
problem, because opening a Xapian database via the Xapian-Tcl bindings
results in:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
cat 2803 eric 5w REG 8,9 0 526601 /home/eric/omega/data/newsgroups/flintlock
No lock here either (and this is not even a Notmuch database).
Investigations will continue.
Eric
--
ms fnd in a lbry
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