1. Prevent
deadlocks with
JMeter
O l e k s i i Z o z u l e n k o
automated-testing.info

2. History

3. deadlock - is ... ?
Не разрешимая
ситуация, которая
возникает при попытке
одновременно получить
доступ к одному
ресурсу с нескольких
потоков или источников

4. 5%
15%
80%
Database
Threads Sync
Others

5. Example

6. UPDATE products AS p, products AS pp
SET p.is_low_on_stock =
IFNULL(p.products_low_stock_level,
IFNULL(pp.products_low_stock_level,
0)) >= p.products_quantity,
pp.is_low_on_stock =
IFNULL(p.products_low_stock_level,
IFNULL(pp.products_low_stock_level,
0)) >= p.products_quantity WHERE
p.products_parent = pp.products_id AND
pp.products_id IN (5000, 10529);

7. Tools

8. Tools

9. Tools
JDBC Sampler
BSF Sampler
Your Own Sampler

10. Assume Causes

11. SELECT p.is_low_on_stock,
p.products_low_stock_level,
p.products_quantity, pp.is_low_on_stock
FROM products AS p, products AS pp
WHERE p.products_parent =
pp.products_id AND pp.products_id IN
(5000, 10529);
INSERT into products(product_id,
product_title, is_low_on_stock,
products_low_stock_level) values (NULL,
‘sometitle’, 5,0);

13. Users = Requests

14. Failure Example

19. Thanks
Oleksii Zozulenko
ozozulenko@gmail.com
automated-testing.info