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This adds a new document value that stores the revision of the last modification to message metadata, where the revision number increases monotonically with each database commit. An alternative would be to store the wall-clock time of the last modification of each message. In principle this is simpler and has the advantage that any process can determine the current timestamp without support from libnotmuch. However, even assuming a computer's clock never goes backward and ignoring clock skew in networked environments, this has a fatal flaw. Xapian uses (optimistic) snapshot isolation, which means reads can be concurrent with writes. Given this, consider the following time line with a write and two read transactions: write |-X-A--------------| read 1 |---B---| read 2 |---| The write transaction modifies message X and records the wall-clock time of the modification at A. The writer hangs around for a while and later commits its change. Read 1 is concurrent with the write, so it doesn't see the change to X. It does some query and records the wall-clock time of its results at B. Transaction read 2 later starts after the write commits and queries for changes since wall-clock time B (say the reads are performing an incremental backup). Even though read 1 could not see the change to X, read 2 is told (correctly) that X has not changed since B, the time of the last read. In fact, X changed before wall-clock time A, but the change was not visible until *after* wall-clock time B, so read 2 misses the change to X. This is tricky to solve in full-blown snapshot isolation, but because Xapian serializes writes, we can use a simple, monotonically increasing database revision number. Furthermore, maintaining this revision number requires no more IO than a wall-clock time solution because Xapian already maintains statistics on the upper (and lower) bound of each value stream. |
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| bindings | ||
| compat | ||
| completion | ||
| contrib | ||
| debian | ||
| devel | ||
| doc | ||
| emacs | ||
| lib | ||
| packaging | ||
| parse-time-string | ||
| performance-test | ||
| test | ||
| util | ||
| vim | ||
| .dir-locals.el | ||
| .gitignore | ||
| .travis.yml | ||
| AUTHORS | ||
| command-line-arguments.c | ||
| command-line-arguments.h | ||
| configure | ||
| COPYING | ||
| COPYING-GPL-3 | ||
| crypto.c | ||
| debugger.c | ||
| gmime-filter-reply.c | ||
| gmime-filter-reply.h | ||
| hooks.c | ||
| INSTALL | ||
| Makefile | ||
| Makefile.local | ||
| mime-node.c | ||
| NEWS | ||
| notmuch-client.h | ||
| notmuch-compact.c | ||
| notmuch-config.c | ||
| notmuch-count.c | ||
| notmuch-dump.c | ||
| notmuch-emacs-mua | ||
| notmuch-insert.c | ||
| notmuch-new.c | ||
| notmuch-reply.c | ||
| notmuch-restore.c | ||
| notmuch-search.c | ||
| notmuch-setup.c | ||
| notmuch-show.c | ||
| notmuch-tag.c | ||
| notmuch-time.c | ||
| notmuch.c | ||
| notmuch.desktop | ||
| query-string.c | ||
| README | ||
| README.rst | ||
| sprinter-json.c | ||
| sprinter-sexp.c | ||
| sprinter-text.c | ||
| sprinter.h | ||
| tag-util.c | ||
| tag-util.h | ||
| version | ||
Notmuch - thread-based email index, search and tagging. Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages in maildir or mh format. It uses the Xapian library to provide fast, full-text search with a convenient search syntax. Notmuch is free software, released under the GNU General Public License version 3 (or later). Building notmuch ---------------- See the INSTALL file for notes on compiling and installing notmuch. Running notmuch --------------- After installing notmuch, start by running "notmuch setup" which will interactively prompt for configuration information such as your name, email address, and the directory which contains your mail archive to be indexed. You can change any answers later by running "notmuch setup" again or by editing the .notmuch-config file in your home directory. With notmuch configured you should next run "notmuch new" which will index all of your existing mail. This can take a long time, (several hours) if you have a lot of email, (hundreds of thousands of files). When new mail is delivered to your mail archive in the future, you will want to run "notmuch new" again. These runs will be much faster as they will only index new messages. Finally, you can prove to yourself that things are working by running some command-line searches such as "notmuch search from:someone@example.com" or "notmuch search subject:topic". See "notmuch help search-terms" for more details on the available search syntax. The command-line search output is not expected to be particularly friendly for day-to-day usage. Instead, it is expected that you will use an email interface that builds on the notmuch command-line tool or the libnotmuch library. Notmuch installs a full-featured email interface for use within emacs. To use this, first add the following line to your .emacs file: (autoload 'notmuch "notmuch" "Notmuch mail" t) Then, either run "emacs -f notmuch" or execute the command "M-x notmuch" from within a running emacs. If you're interested in a non-emacs-based interface to notmuch, then please join the notmuch community. Various other interfaces are already in progress, (an interface within vim, a curses interface, graphical interfaces based on evolution, and various web-based interfaces). The authors of these interfaces would love further testing or contribution. See contact information below. Contacting users and developers ------------------------------- The website for Notmuch is: http://notmuchmail.org The mailing list address for the notmuch community is: notmuch@notmuchmail.org We welcome any sort of questions, comments, kudos, or code there. Subscription is not required, (but if you do subscribe you'll avoid any delay due to moderation). See the website for subscription information. There is also an IRC channel dedicated to talk about using and developing notmuch: IRC server: irc.freenode.net Channel: #notmuch