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epriestley aae5f9efd3 Implement a more compact, general database-backed key-value cache
Summary:
See discussion in D4204. Facebook currently has a 314MB remarkup cache with a 55MB index, which is slow to access. Under the theory that this is an index size/quality problem (the current index is on a potentially-384-byte field, with many keys sharing prefixes), provide a more general index with fancy new features:

  - It implements PhutilKeyValueCache, so it can be a component in cache stacks and supports TTL.
  - It has a 12-byte hash-based key.
  - It automatically compresses large blocks of data (most of what we store is highly-compressible HTML).

Test Plan:
  - Basics:
    - Loaded /paste/, saw caches generate and save.
    - Reloaded /paste/, saw the page hit cache.
  - GC:
    - Ran GC daemon, saw nothing.
    - Set maximum lifetime to 1 second, ran GC daemon, saw it collect the entire cache.
  - Deflate:
    - Selected row formats from the database, saw a mixture of 'raw' and 'deflate' storage.
    - Used profiler to verify that 'deflate' is fast (12 calls @ 220us on my paste list).
  - Ran unit tests

Reviewers: vrana, btrahan

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D4259
2012-12-21 14:17:56 -08:00
bin Implement SSHD glue and Conduit SSH endpoint 2012-12-19 11:08:07 -08:00
conf Implement a more compact, general database-backed key-value cache 2012-12-21 14:17:56 -08:00
externals one more phame tweak for better social sharing -- make sure $uri is the full uri 2012-12-21 13:46:23 -08:00
resources Implement a more compact, general database-backed key-value cache 2012-12-21 14:17:56 -08:00
scripts Fix various issues with SSH receivers 2012-12-19 11:11:32 -08:00
src Implement a more compact, general database-backed key-value cache 2012-12-21 14:17:56 -08:00
support Make bin/aphlict behave slightly better when forking 2012-12-20 10:38:13 -08:00
webroot Status events from others were not clearly visible. 2012-12-21 10:15:48 -08:00
.arcconfig Delete license headers from files 2012-11-05 11:16:51 -08:00
.divinerconfig Centralize rendering of application mail bodies 2012-07-16 19:01:43 -07:00
.editorconfig Specify config for text editors 2012-11-03 22:34:44 -07:00
.gitignore Remove support for custom logos 2012-07-30 11:09:28 -07:00
.gitmodules Just change the location. 2011-05-28 15:14:54 -07:00
LICENSE Delete license headers from files 2012-11-05 11:16:51 -08:00
NOTICE Delete license headers from files 2012-11-05 11:16:51 -08:00
README Delete license headers from files 2012-11-05 11:16:51 -08:00

Phabricator is a open source collection of web applications which make it easier
to write, review, and share source code. Phabricator was developed at Facebook.

This is an early release. It's pretty high-quality and usable, but under
active development so things may change quickly.

You can learn more about the project and find links to documentation and
resources at: http://phabricator.org/

LICENSE

Phabricator is released under the Apache 2.0 license except as otherwise noted.