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<title>[8897] sites/trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/libs/site-search/jetpack-search.php: Plugin Directory: Search: Include some debug info in the search stampede code to isolate some cache bugs.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/8897">8897</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/8897","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dd32</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-05-30 07:04:41 +0000 (Thu, 30 May 2019)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Plugin Directory: Search: Include some debug info in the search stampede code to isolate some cache bugs.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwordpressorgpublic_htmlwpcontentpluginsplugindirectorylibssitesearchjetpacksearchphp">sites/trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/libs/site-search/jetpack-search.php</a></li>
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<h3>Diff</h3>
<a id="sitestrunkwordpressorgpublic_htmlwpcontentpluginsplugindirectorylibssitesearchjetpacksearchphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/libs/site-search/jetpack-search.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/libs/site-search/jetpack-search.php 2019-05-30 05:49:35 UTC (rev 8896)
+++ sites/trunk/wordpress.org/public_html/wp-content/plugins/plugin-directory/libs/site-search/jetpack-search.php 2019-05-30 07:04:41 UTC (rev 8897)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -225,6 +225,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $json_es_args = json_encode( $es_args );
</span><span class="cx" style="display: block; padding: 0 10px"> $cache_key = md5( $json_es_args );
</span><span class="cx" style="display: block; padding: 0 10px"> $lock_key = 'lock-' . $cache_key;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $count_key = 'count-' . $cache_key;
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> $response = wp_cache_get( $cache_key, self::CACHE_GROUP );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -231,6 +232,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // Use a temporary lock to prevent cache stampedes. This ensures only one process (per search term per memcache instance) will run the remote post.
</span><span class="cx" style="display: block; padding: 0 10px"> // Other processes will use the stale cached value if it's present, even for a while after the expiration time if a fresh value is still being fetched.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( wp_cache_add( $lock_key, 1, self::CACHE_GROUP, 15 ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Keep track of the number of concurrent requests for this key
+ wp_cache_set( $count_key, 1, self::CACHE_GROUP, 60 );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // If the error volume is high, there's a proportionally lower chance that we'll actually attempt to hit the API.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( $this->error_volume_is_low() ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -296,7 +299,12 @@
</span><span class="cx" style="display: block; padding: 0 10px"> } else {
</span><span class="cx" style="display: block; padding: 0 10px"> // Stampede protection has kicked in, AND we have no stale cached value to display. That's bad - possibly indicates cache exhaustion
</span><span class="cx" style="display: block; padding: 0 10px"> if ( false === $response ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- trigger_error( 'Plugin directory search: no cached results available during stampede.', E_USER_WARNING );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Keep a track of how many cache stampede's happen per minute.
+ wp_cache_incr( 'search-stampede-failures', 1, self::CACHE_GROUP ) || wp_cache_set( 'search-stampede-failures', 1, self::CACHE_GROUP, 60 );
+
+ // Include the number of times this branch has been hit
+ $request_count = wp_cache_incr( $count_key, 1, self::CACHE_GROUP );
+ trigger_error( 'Plugin directory search: no cached results available during stampede. Requests: ' . $request_count, E_USER_WARNING );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre>
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