Updated to line up with

php-memcached-dev/php-memcached#269

PHP Warning: session_start(): Unable to clear session lock record.

Author: csev

config.php

@@ -80,8 +80,8 @@
 if ( isset($CFG->memcached) && strlen($CFG->memcached) > 0 ) {
     ini_set('session.save_handler', 'memcached');
     ini_set('session.save_path', $CFG->memcached);
-    ini_set('memcached.sess_lock_wait_min', 150);
-    ini_set('memcached.sess_lock_wait_max', 150);
+    // https://github.com/php-memcached-dev/php-memcached/issues/269
+    ini_set('memcached.sess_locking', '0');
 }
 
 // http://docs.aws.amazon.com/aws-sdk-php/v2/guide/feature-dynamodb-session-handler.html