![]() IssueNestedSetConcurrencyTest#test_concurrent_subtasks_creation :Įxpected "Mysql2::Error: Deadlock found when trying to get lock try restarting transaction: SELECT `issues`.`id` FROM `issues` WHERE (root_id IN (SELECT root_id FROM issues WHERE id IN (229))) ORDER BY `issues`.`id` ASC FOR UPDATE" to be nil. IssueNestedSetConcurrencyTest#test_concurrency :Įxpected "Mysql2::Error: Deadlock found when trying to get lock try restarting transaction: SELECT `issues`.`id` FROM `issues` WHERE (root_id IN (SELECT root_id FROM issues WHERE id IN (225))) ORDER BY `issues`.`id` ASC FOR UPDATE" to be nil. As previously indicated, if you want to understand, in detail, how to diagnose a deadlock, please review the links in the references below. We should not bypass them unless willing to compromise our data. They are mechanisms that exist to keep our data consistent. MySQL will detect deadlocks and kill one of the transactions (making it rollback), and the deadlock will be printed in SEIS (show engine innodb status). MySQL deadlocks (and locks) should be seen as friends. var/lib/gems/2.3.0/gems/htmlentities-4.3.1/lib/htmlentities/mappings/expanded.rb:465: warning: key "inodot" is duplicated and overwritten on line 466įinished in 2.488381s, 0.8037 runs/s, 1.6075 assertions/s. As explained in How to Deal with MySQL Deadlocks, a deadlock occurs when two or more transactions mutually hold and request for locks, creating a cycle of dependencies. Ruby test/unit/issue_nested_set_concurrency_test.rb So for now it appears manually locking the table is the only thing that works.This Unit Test is always failing in my setup with MySQL.Īll other Tests run with rake test are fine. WITH CONSISTENT SNAPSHOT and READ WRITE still gave me deadlock error, while READ ONLY naturally didn't even allow me to execute the INSERT. All 3 options required PDO::setAttribute(PDO::ATTR_EMULATE_PREPARES, true) to be set. Is that the only way to get this to work, or can I with 100% certainty prevent deadlocks without having to manually lock the table?ġ) Putting the query in a transaction - still deadlock errorĢ) Starting the transaction with WITH CONSISTENT SNAPSHOT, READ WRITE, READ ONLY. With that method I ran the code 4 times simultaneously, each instance inserting 2500 users, without problems. restarting transaction nested exception is .jdbc4. I'm throwing all the response into a queue and then processing them. MySQLTransactionRollbackException: Deadlock found when trying to get lock. At certain times of the day, I can receive hundreds of responses in just a few seconds. The data is transactional information from a payment gateway. Insert into `tt_users` (`state`, `state_position`)Īnd then: PDO::setAttribute(PDO::ATTR_EMULATE_PREPARES, false) 1 I have a Laravel application that receives responses from a webhook. Then locking the table manually, and running my query: SET autocommit=0 Deadlocks in MySQL occur when two or more transactions mutually hold and request for locks. The only way I managed to get this to work, and work consistently, is this (language is PHP): PDO::setAttribute(PDO::ATTR_EMULATE_PREPARES, true) ![]() I read this post - How to avoid mysql 'Deadlock found when trying to get lock try restarting transaction' but I didn't understand what I should do with my query to prevent deadlocks, if that is at all possible, since the answer to this question - Working around MySQL error "Deadlock found when trying to get lock try restarting transaction" - says deadlocks can happen no matter what. DBD::mysql::st execute failed: Deadlock found when trying to get lock try restarting transaction at Db.pm line 276. ![]() (SELECT MAX(state_position) AS maxStatePositionįor testing, I inserted a large amount of users simultaneously, and each time I got the deadlock error. This is the query I'm running that causes deadlocks: insert into `tt_users` (`state`, `state_position`) if I have 5 users with state 'x', their state_positions must be 1,2,3,4,5 ![]() State_positions must always be consecutive, and there may never be a duplicate position for a certain state, i.e. I am using mysql 5.5, All tables are innoDB and in all cases id is the primary key (int) with autoincrement. I have table tt_users which has id as primary key, and columns state (CHAR(1)), which can be "x" or "y", and state_position (INT). Mysql - Serialization failure: 1213 Deadlock found when try to get lock try restarting transaction Ask Question Asked 7 years, 5 months ago Modified 7 years, 5 months ago Viewed 38k times 7 I have menus, categories and products tables. ![]()
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