From: David Bremner <david@tethera.net>
To: Notmuch Mail <notmuch@notmuchmail.org>
Subject: experimental logging branch
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	(x86_64-pc-linux-gnu)
Date: Sat, 10 Dec 2011 23:27:02 -0400
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I have pushed a branch jlog=20

  git://pivot.cs.unb.ca/notmuch.git

This uses the jlog library (http://labs.omniti.com/labs/jlog)
to atomically log messages in pub-sub model.

On this branch you can enable logging of tagging operations by=20

   notmuch config set log.subscribers 'name1;name2;name3'

the "subscriber names" identify clients (one could imagine one client
deals with general tag syncing, another with nmbug, or so).
=20=20
One can read the log via the jlog api (there are perl bindings) or via
the "notmuch log" command.=20

    notmuch log name1=20

will print all of the log messages since the last time the queue was
read.

for e.g., tag removal, these lines look like

T-1322702130-26068-3-git-send-email-bremner@debian.org test
T-1322702130-26068-1-git-send-email-bremner@debian.org test
T-7fbe6befcf31881a9bca672f55b93501249a220c.1322859389.git.jani@nikula.org t=
est
T-716da00e176e1dc6af0ba248caee40acee733120.1322859389.git.jani@nikula.org t=
est

An example application would be a cron job that writes all tag changes
to some nmbug like git repo.

There are a few rough edges and I expect to rebase the branch a bit
more, but feel free to have a look at it.  I guess I'm curious if people
think jlog is an acceptable dependency, and whether the whole logging
thing seems worthwhile.=20

I did some preliminary tests, and for adding or deleting a tag to 200k
messages, this added about a 5% time penalty. I didn't notice any really
heavy I/O (no SSD here, but i7 cpu). Tests were roughly 95% CPU bound.

There are some preliminary debian packages for jlog at=20

      git://pivot.cs.unb.ca/jlog.git

The upstream source for jlog is at=20
=20=20=20=20
    https://github.com/omniti-labs/jlog




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