From 1ad799fac8340302b6c2cfdc97a845d647aa948d Mon Sep 17 00:00:00 2001
From: pratikshad <pratiksha.dubey@webaccess.co.in>
Date: Fri, 30 Jan 2015 17:54:25 +1000
Subject: [PATCH] Fixed issue of deadlock CRM-15470

----------------------------------------
* CRM-15470: MySQL transaction deadlocks with multiple simultaneous recurring contribution updates
  https://issues.civicrm.org/jira/browse/CRM-15470
---
 CRM/Activity/BAO/Activity.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/CRM/Activity/BAO/Activity.php b/CRM/Activity/BAO/Activity.php
index e156a526b9..74603d8570 100644
--- a/CRM/Activity/BAO/Activity.php
+++ b/CRM/Activity/BAO/Activity.php
@@ -270,7 +270,13 @@ class CRM_Activity_BAO_Activity extends CRM_Activity_DAO_Activity {
     if ($recordTypeID) {
       $activityContact->record_type_id = $recordTypeID;
     }
-    $activityContact->delete();
+
+    //let's check if activity contact record exits and then delete.
+    //looks like delete leads to deadlock when multiple simultaneous
+    //requests are done. CRM-15470
+    if ($activityContact->find()) {
+      $activityContact->delete();
+    }
   }
 
   /**
-- 
2.25.1