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OStatus plugin: Rolling batch queueing for PuSH output to >50 subscribing sites. Keeps latency down for other things enqueued while we work...

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This commit is contained in:
Brion Vibber 2010-06-04 11:48:54 -07:00
parent 8b9436e8ae
commit 41e9dba729
3 changed files with 52 additions and 1 deletions
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2
plugins/OStatus/OStatusPlugin.php
View File

@ -87,6 +87,8 @@ class OStatusPlugin extends Plugin
// Outgoing from our internal PuSH hub
$qm->connect('hubconf', 'HubConfQueueHandler');
$qm->connect('hubprep', 'HubPrepQueueHandler');
$qm->connect('hubout', 'HubOutQueueHandler');
// Outgoing Salmon replies (when we don't need a return value)

20
plugins/OStatus/classes/HubSub.php
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@ -304,6 +304,26 @@ class HubSub extends Memcached_DataObject
$qm->enqueue($data, 'hubout');
}
/**
* Queue up a large batch of pushes to multiple subscribers
* for this same topic update.
*
* If queues are disabled, this will run immediately.
*
* @param string $atom well-formed Atom feed
* @param array $pushCallbacks list of callback URLs
*/
function bulkDistribute($atom, $pushCallbacks)
{
$data = array('atom' => $atom,
'topic' => $this->topic,
'pushCallbacks' => $pushCallbacks);
common_log(LOG_INFO, "Queuing PuSH batch: $this->topic to " .
count($pushCallbacks) . " sites");
$qm = QueueManager::get();
$qm->enqueue($data, 'hubprep');
}
/**
* Send a 'fat ping' to the subscriber's callback endpoint
* containing the given Atom feed chunk.

31
plugins/OStatus/lib/ostatusqueuehandler.php
View File

@ -25,6 +25,18 @@
*/
class OStatusQueueHandler extends QueueHandler
{
// If we have more than this many subscribing sites on a single feed,
// break up the PuSH distribution into smaller batches which will be
// rolled into the queue progressively. This reduces disruption to
// other, shorter activities being enqueued while we work.
const MAX_UNBATCHED = 50;
// Each batch (a 'hubprep' entry) will have this many items.
// Selected to provide a balance between queue packet size
// and number of batches that will end up getting processed.
// For 20,000 target sites, 1000 should work acceptably.
const BATCH_SIZE = 1000;
function transport()
{
return 'ostatus';
@ -147,14 +159,31 @@ class OStatusQueueHandler extends QueueHandler
/**
* Queue up direct feed update pushes to subscribers on our internal hub.
* If there are a large number of subscriber sites, intermediate bulk
* distribution triggers may be queued.
*
* @param string $atom update feed, containing only new/changed items
* @param HubSub $sub open query of subscribers
*/
function pushFeedInternal($atom, $sub)
{
common_log(LOG_INFO, "Preparing $sub->N PuSH distribution(s) for $sub->topic");
$n = 0;
$batch = array();
while ($sub->fetch()) {
$sub->distribute($atom);
$n++;
if ($n < self::MAX_UNBATCHED) {
$sub->distribute($atom);
} else {
$batch[] = $sub->callback;
if (count($batch) >= self::BATCH_SIZE) {
$sub->bulkDistribute($atom, $batch);
$batch = array();
}
}
}
if (count($batch) >= 0) {
$sub->bulkDistribute($atom, $batch);
}
}