From 41e9dba7297d43b7de0cb7665901869910d1047a Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Fri, 4 Jun 2010 11:48:54 -0700
Subject: OStatus plugin: Rolling batch queueing for PuSH output to >50
 subscribing sites. Keeps latency down for other things enqueued while we
 work...

---
 plugins/OStatus/lib/ostatusqueuehandler.php | 31 ++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'plugins/OStatus/lib')

diff --git a/plugins/OStatus/lib/ostatusqueuehandler.php b/plugins/OStatus/lib/ostatusqueuehandler.php
index d1e58f1d6..8905d2e21 100644
--- a/plugins/OStatus/lib/ostatusqueuehandler.php
+++ b/plugins/OStatus/lib/ostatusqueuehandler.php
@@ -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);
         }
     }
 
-- 
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