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Ran 22 Feb 2016 05:03AM UTC

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Committed 22 Feb 2016 05:00AM UTC coverage: 99.237% (+0.001%) from 99.236%

Job # 1.9.3

Build Type

push

travis-ci

Committed by

nurse

Commit Message

Use CONNECTION_ID() for finer grained locking

To acquire tasks, run UPDATE and SELECT insteadof SELECT and UPDATE.

This adds a new column `owner` to identify which connection acquires the task.
With this column, RDBCompatBackend#acquire now doesn't get table lock nor use
GET_LOCK(), but adopt mark-and-select method.
It locks only oldest N rows and their gaps during UPDATE.

CONNECTION_ID()
---------------

64bit unsigned integer from the server's internal thread ID counter.
This is unique while the MySQL server running.
http://dev.mysql.com/doc/refman/5.6/en/information-functions.html#function_connection-id
https://bugs.mysql.com/bug.php?id=19806

References
---------------

* http://yuuki.hatenablog.com/entry/go-and-mysql-jobqueue
* https://blog.engineyard.com/2011/5-subtle-ways-youre-using-mysql-as-a-queue-and-why-itll-bite-you
* https://github.com/treasure-data/perfectqueue/pull/15#discussion_r52893022

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