in-memory-cache TODO

The in-memory-cache branch is nearing completion. It unifies various
caches found in FSFS behind a simple API, and allows the caches to be
implemented either in process as hashes or with memcached. If you use
memcached (which is enabled in a new fsfs.conf file), caches can live
longer than the lifetime of a single svn_fs_t.

Remaining TODO:
 - Move the code which makes an apr_memcache_t based on an
svn_config_t to libsvn_subr from FSFS, and use it in the C test.
 - Build system issues (mostly done by a cache I have from dchristian).
 - Add --memcache options to the test suite.
 - Actually run a real benchmark.
 - Document the fact that all errors communicating with memcached are
fail-stop. This is a problem that should be solved with a better svn
logging infrastructure, which we ought to get before 1.6 anyway (it's
a high priority for my team).

Once it's on trunk, I'll consider making more things cachable
(representations, say).

--dave

-- 
David Glasser | glasser@davidglasser.net | http://www.davidglasser.net/
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