From: Jani Nikula Date: Thu, 1 Jan 2015 18:22:03 +0000 (+0200) Subject: [PATCH] HACK: lib: add brute and ignorant handling of database lock errors X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=73191074b66217b57900741c304d5533cd3c87ea;p=notmuch-archives.git [PATCH] HACK: lib: add brute and ignorant handling of database lock errors --- diff --git a/41/b01274da9acae510c3db192d4e54884dcfdbac b/41/b01274da9acae510c3db192d4e54884dcfdbac new file mode 100644 index 000000000..d8fcd7acd --- /dev/null +++ b/41/b01274da9acae510c3db192d4e54884dcfdbac @@ -0,0 +1,116 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by olra.theworths.org (Postfix) with ESMTP id E91D5431FC0 + for ; Thu, 1 Jan 2015 10:22:00 -0800 (PST) +X-Virus-Scanned: Debian amavisd-new at olra.theworths.org +X-Spam-Flag: NO +X-Spam-Score: -0.7 +X-Spam-Level: +X-Spam-Status: No, score=-0.7 tagged_above=-999 required=5 + tests=[RCVD_IN_DNSWL_LOW=-0.7] autolearn=disabled +Received: from olra.theworths.org ([127.0.0.1]) + by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id kwOSoCmIUgiI for ; + Thu, 1 Jan 2015 10:21:57 -0800 (PST) +Received: from mail-wi0-f174.google.com (mail-wi0-f174.google.com + [209.85.212.174]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) + (No client certificate requested) + by olra.theworths.org (Postfix) with ESMTPS id 806D4431FAF + for ; Thu, 1 Jan 2015 10:21:57 -0800 (PST) +Received: by mail-wi0-f174.google.com with SMTP id h11so26827084wiw.1 + for ; Thu, 01 Jan 2015 10:21:56 -0800 (PST) +X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; + d=1e100.net; s=20130820; + h=x-gm-message-state:from:to:cc:subject:date:message-id; + bh=0uSzEjuDOGI7a2nIRhECAFVYQEhm/l4emJvljfVRG9A=; + b=Lh1iw7qttnpROzfvKwvXkWmJMwO8B+uPQP9lh/tI4KJn1Hv9XgF3BAPpKNyRQVAsLg + ZLXgRGwJ+gJ9Wf/ZY8FXCjinnWPR4j9oOQ+PmWbX4fDGZBIvijF8qwQMg+Jar74iHxgv + q+jmTSzNC4e1XD3tXO7ACqiOJstr3fv0NgfN8qsnX7txuXIqJW51sKNa4TqGRX2mYfIw + bH12k7B1m6PqVV/kgsrvJgE5RSkQFIE/r+yzci8gtV4tRd/K/FDU5hrCQLJ3g7R8Hp6g + bmm3D1JGopuhpoYGIHcjl8uzKFIMVsahtIfzDHeojEfvS6MlqL1gRai/B5HDJ2dG5dN3 + Sh7w== +X-Gm-Message-State: + ALoCoQmJpAWME6es/3LeMYTA+0SElJR0+BjRGS9VnYiSKUZqpxJHcWuePcSg0b8XHGC+teEREdFr +X-Received: by 10.194.175.69 with SMTP id by5mr139926544wjc.32.1420136516193; + Thu, 01 Jan 2015 10:21:56 -0800 (PST) +Received: from localhost (dsl-hkibrasgw2-58c371-91.dhcp.inet.fi. + [88.195.113.91]) + by mx.google.com with ESMTPSA id lg7sm51493931wic.0.2015.01.01.10.21.55 + (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); + Thu, 01 Jan 2015 10:21:55 -0800 (PST) +From: Jani Nikula +To: notmuch@notmuchmail.org +Subject: [PATCH] HACK: lib: add brute and ignorant handling of database lock + errors +Date: Thu, 1 Jan 2015 20:22:03 +0200 +Message-Id: <1420136523-27100-1-git-send-email-jani@nikula.org> +X-Mailer: git-send-email 2.1.4 +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.13 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Thu, 01 Jan 2015 18:22:01 -0000 + +From: Jani Nikula + +Instead of failing at first try, back off for an increasing number of +seconds, and only fail after three attempts. + +One of my notmuch installations that gets plenty of mail hits db +locked exceptions quite often, and even more than before since I +switched to using notmuch insert. These are quite annoying in the +Emacs UI as there is virtually no error handling for tagging, and the +tag change highlighting gets confused. + +This is a dirty hack, but for me it's much more preferrable to the the +db locked exceptions. With the retries and increasing back-off timeout +I hardly ever see the exceptions now. + +Maybe this inspires someone to fix this for real. ;) +--- + lib/database.cc | 19 +++++++++++++++++-- + 1 file changed, 17 insertions(+), 2 deletions(-) + +diff --git a/lib/database.cc b/lib/database.cc +index 3601f9ded307..50063c55969b 100644 +--- a/lib/database.cc ++++ b/lib/database.cc +@@ -819,8 +819,23 @@ notmuch_database_open (const char *path, + string last_thread_id; + + if (mode == NOTMUCH_DATABASE_MODE_READ_WRITE) { +- notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path, +- Xapian::DB_CREATE_OR_OPEN); ++ /* ++ * Brute and ignorant handling of database lock errors. ++ * Instead of failing at first try, back off for an ++ * increasing number of seconds. ++ */ ++ for (unsigned int tries = 1; ! notmuch->xapian_db; tries++) { ++ try { ++ notmuch->xapian_db = ++ new Xapian::WritableDatabase (xapian_path, ++ Xapian::DB_CREATE_OR_OPEN); ++ } catch (const Xapian::DatabaseLockError &error) { ++ if (tries > 3) ++ throw; ++ ++ sleep(tries); ++ } ++ } + } else { + notmuch->xapian_db = new Xapian::Database (xapian_path); + } +-- +2.1.4 +