From 5ad890854c29879113831f2258bdd657b74c914c Mon Sep 17 00:00:00 2001
From: Riju19 <19.riju@gmail.com>
Date: Mon, 8 Apr 2019 11:12:42 +0530
Subject: [PATCH] Retry on DB deadlock when updating story

Updating the updated_at time of a story when creating a new task seems to be prone to deadlocks, which results in the task not getting created. This patch retries the update thrice.

Change-Id: I1e657d9eb64717f1dfbaf53d843675ee686c774d
Task: 4141
Signed-off-by: Riju19 <19.riju@gmail.com>
---
 storyboard/db/api/stories.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/storyboard/db/api/stories.py b/storyboard/db/api/stories.py
index dd07030b..7df4eb45 100644
--- a/storyboard/db/api/stories.py
+++ b/storyboard/db/api/stories.py
@@ -16,6 +16,8 @@
 import datetime
 import pytz
 
+from oslo_db import api as oslo_db_api
+
 from sqlalchemy.orm import subqueryload
 
 from storyboard._i18n import _
@@ -274,6 +276,8 @@ def get_project_ids(story_id, current_user=None):
     return project_ids
 
 
+@oslo_db_api.wrap_db_retry(max_retries=3, retry_on_deadlock=True,
+retry_interval=0.5, inc_retry_interval=True)
 def story_update_updated_at(story_id):
     session = api_base.get_session()
     with session.begin(subtransactions=True):