Made BloomFilterTitleHasLogs refresh odds linear to be smoother

Change-Id: I25a4de8cf3537c9b3f27002e8bbb210322decec5

diff --git a/includes/cache/bloom/BloomFilters.php b/includes/cache/bloom/BloomFilters.php
index 9b710d7..8017bac 100644 (file)
--- a/includes/cache/bloom/BloomFilters.php
+++ b/includes/cache/bloom/BloomFilters.php
@@ -26,8 +26,11 @@ class BloomFilterTitleHasLogs {
        public static function mergeAndCheck(
                BloomCache $bcache, $domain, $virtualKey, array $status
        ) {
+               $ttr = 5; // try to refresh before this many seconds
                $age = microtime( true ) - $status['asOfTime']; // seconds
-               $scopedLock = ( mt_rand( 1, (int)pow( 3, max( 0, 5 - $age ) ) ) == 1 )
+               $chance = min( 1, $age / $ttr );
+
+               $scopedLock = ( mt_rand( 1, 1e9 ) <= 1e9 * $chance )
                        ? $bcache->getScopedLock( $virtualKey )
                        : false;