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+ for notmuch@notmuchmail.org; Thu, 18 Feb 2016 13:59:28 +0100\r
+From: Eric J <eric@deptj.eu>\r
+Subject: Re: Lost updates to Notmuch database\r
+To: notmuch@notmuchmail.org\r
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+\r
+On Wed, 17 Feb 2016 21:03:13 -0400, David Bremner <david@tethera.net> wrote:\r
+> Eric J <eric@deptj.eu> writes:\r
+> \r
+> > However, if I do it twice, in different processes, at the same time, one\r
+> > file is added and tagged properly, the other is not (totally unfindable\r
+> > by notmuch search). Neither process reports any error, and they both log\r
+> > their actions normally. Actually a third simultaneous process also fails\r
+> > to leave any result in the database.\r
+> \r
+> It should be impossible for more than one process to open a Xapian\r
+> database for writing at the same time. So if the processes are really\r
+> running in parallel, you should be getting error codes from the later\r
+> calls to notmuch_database_open{_verbose}. You claim that's not\r
+> happening, which is puzzling. Maybe you can try to duplicate your\r
+> problem with a tiny C program.\r
+\r
+Thanks David. Impossible? - yes, but if I do just the open in two\r
+interactive sessions (the Tcl interface makes this easy), I get the\r
+following from "lsof flintlock":\r
+\r
+COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME\r
+cat 21408 eric 5w REG 8,9 0 667773 flintlock\r
+cat 21418 eric 5w REG 8,9 0 667773 flintlock\r
+\r
+So, open for writing, but not locked (the processes have the right\r
+parents).\r
+\r
+I managed to catch a run of "notmuch new" with "lsof -r5 flintlock":\r
+\r
+COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME\r
+cat 20763 eric 3ww REG 8,9 0 667773 flintlock\r
+\r
+which is open for writing and (partially) locked, so it must be doing\r
+something that I'm not. I obviously need to go carefully through the\r
+code to see what that is (and experiment in C if I can't find it!).\r
+\r
+I don't have the _verbose functions BTW, still on 0.18.1 - I thought I\r
+would get a proof-of-concept before upgrading notmuch, but...\r
+\r
+Thanks again,\r
+\r
+Eric\r
+-- \r
+ms fnd in a lbry\r
projects / notmuch-archives.git / commitdiff