Commit Graph

15 Commits

Author SHA1 Message Date
Evan Prodromou
004d58fdb8 Make code-dependent cache entries more volatile
If a cache entry is dependent on the code that's running, upgrading
(or enabling/disabling plugins) can generate hard-to-track
inconsistencies.

This change adds a close-to-unique fingerprint of the running code to
some cache keys, so that if the fingerprint changes, the old values
are ignored and new values are used.

If the automated uniqueness fails, an administrator can add an extra
config value, $config['site']['build'], that's thrown into the key also.
2010-12-06 17:20:26 -05:00
Siebrand Mazeland
b9177f5e2e * i18n/L10n and translator documentation updates.
* whitespace and indentation updates
2010-09-29 00:39:45 +02:00
Brion Vibber
81b6b58e33 Merge branch 'master' into testing
Conflicts:
	lib/stompqueuemanager.php
2010-02-16 09:22:02 -08:00
Brion Vibber
c74aea589d Stomp queue restructuring for mass scalability:
- Multiplexing queues into groups and for multiple sites.
- Sharing vs breakout configurable per site and per queue via $config['queue']['breakout']
- Detect how many times a message is redelivered, discard if it's killed too many daemons
 - count configurable with $config['queue']['max_retries']
 - can dump the items to files in $config['queue']['dead_letter_dir']

Queue daemon memory & resource leak fixes:
- avoid unnecessary reconnections to memcached server (switch persistent connections back in on second initialization, assuming it's child process)
- monkey-patch for leaky .ini loads in DB_DataObject::databaseStructure() - was leaking 200k per active switch
- applied leak fixes to Status_network as well, using intermediate base Safe_DataObject for both it and Memcache_DataObject

Misc queue fixes:
- correct handling of child processes exiting due to signal termination instead of regular exit
- shutdown instead of infinite respawn loop if we're already past the soft memory limit at startup
- Added --all option for xmppdaemon... still opens one xmpp connection per site that has xmpp active

Cache updates:
- add Cache::increment() method with native support for memcached atomic increment
2010-02-16 09:16:51 -08:00
Brion Vibber
875e1a70ce Don't spew warnings on usage of MEMCACHE_COMPRESSED constant when memcache PHP extension is not present.
Switched to a locally-defined Cache::COMPRESSED, translating that to MEMCACHE_COMPRESSED in the plugin.
2010-02-05 09:47:56 -08:00
Brion Vibber
ec145b73fc Major refactoring of queue handlers to support running multiple sites in one daemon.
Key changes:
* Initialization code moved from common.php to StatusNet class;
  can now switch configurations during runtime.
* As a consequence, configuration files must now be idempotent...
  Be careful with constant, function or class definitions.
* Control structure for daemons/QueueManager/QueueHandler has been refactored;
  the run loop is now managed by IoMaster run via scripts/queuedaemon.php
  IoManager subclasses are woken to handle socket input or polling, and may
  cover multiple sites.
* Plugins can implement notice queue handlers more easily by registering a
  QueueHandler class; no more need to add a daemon.

The new QueueDaemon runs from scripts/queuedaemon.php:

* This replaces most of the old *handler.php scripts; they've been refactored
  to the bare handler classes.
* Spawns multiple child processes to spread load; defaults to CPU count on
  Linux and Mac OS X systems, or override with --threads=N
* When multithreaded, child processes are automatically respawned on failure.
* Threads gracefully shut down and restart when passing a soft memory limit
  (defaults to 90% of memory_limit), limiting damage from memory leaks.
* Support for UDP-based monitoring: http://www.gitorious.org/snqmon

Rough control flow diagram:
QueueDaemon -> IoMaster -> IoManager
                           QueueManager [listen or poll] -> QueueHandler
                           XmppManager [ping & keepalive]
                           XmppConfirmManager [poll updates]

Todo:

* Respawning features not currently available running single-threaded.
* When running single-site, configuration changes aren't picked up.
* New sites or config changes affecting queue subscriptions are not yet
  handled without a daemon restart.
* SNMP monitoring output to integrate with general tools (nagios, ganglia)
* Convert XMPP confirmation message sends to use stomp queue instead of polling
* Convert xmppdaemon.php to IoManager?
* Convert Twitter status, friends import polling daemons to IoManager
* Clean up some error reporting and failure modes
* May need to adjust queue priorities for best perf in backlog/flood cases

Detailed code history available in my daemon-work branch:
http://www.gitorious.org/~brion/statusnet/brion-fixes/commits/daemon-work
2010-01-12 20:45:09 -08:00
Brion Vibber
aff78e5121 Cache fixes:
* We now cache negative lookups; clear them in Memcached_DataObject->insert()
* Mark file.url as a unique key in statusnet.ini so its negative lookups are cleared properly (first save of a notice with a new URL was failing due to double-insert)
* Now using serialization for default in-process cache instead of just saving objects; avoids potential corruption if you save an object to cache, change the original object, then fetch the same key from cache again
2010-01-05 15:05:53 -08:00
Brion Vibber
16254c14c8 Typo fix in the new default in-process cache; spewed notice warnings on deletion, breaking XHR responses. 2010-01-05 09:54:43 -08:00
Evan Prodromou
a1821ec8af default value for cache::get() changed from null to false 2010-01-04 09:59:47 -10:00
Evan Prodromou
bfa3aa0e7f Remove logging from default cache 2010-01-03 11:28:15 -10:00
Evan Prodromou
cc5534d180 First version of Memcache plugin 2010-01-02 21:16:59 -10:00
Evan Prodromou
1e1062ca9c Make cache.php PHPCS-clean 2010-01-02 21:00:42 -10:00
Evan Prodromou
65d07b657d invert if for cache handling 2010-01-02 20:37:30 -10:00
Evan Prodromou
e1de1bf0fe fix default array implementation checks 2010-01-02 20:32:56 -10:00
Evan Prodromou
c5d23e27a6 Make caching a plugin system 2010-01-02 20:26:33 -10:00