From ec145b73fc91dd54695dd374c8a71a11e233b8c0 Mon Sep 17 00:00:00 2001 From: Brion Vibber Date: Tue, 12 Jan 2010 19:57:15 -0800 Subject: 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 --- classes/Queue_item.php | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'classes/Queue_item.php') diff --git a/classes/Queue_item.php b/classes/Queue_item.php index 9c673540d..cf805a606 100644 --- a/classes/Queue_item.php +++ b/classes/Queue_item.php @@ -25,10 +25,12 @@ class Queue_item extends Memcached_DataObject function sequenceKey() { return array(false, false); } - static function top($transport) { + static function top($transport=null) { $qi = new Queue_item(); - $qi->transport = $transport; + if ($transport) { + $qi->transport = $transport; + } $qi->orderBy('created'); $qi->whereAdd('claimed is null'); @@ -40,7 +42,8 @@ class Queue_item extends Memcached_DataObject # XXX: potential race condition # can we force it to only update if claimed is still null # (or old)? - common_log(LOG_INFO, 'claiming queue item = ' . $qi->notice_id . ' for transport ' . $transport); + common_log(LOG_INFO, 'claiming queue item = ' . $qi->notice_id . + ' for transport ' . $qi->transport); $orig = clone($qi); $qi->claimed = common_sql_now(); $result = $qi->update($orig); -- cgit v1.2.3-54-g00ecf