288
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Ran 24 Aug 2016 10:09AM UTC

Jobs 4

Files 30

Run time 4min

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Build # 288

Build Type

push

travis-ci

Committed by

nurse

Commit Message

UPDATE first strategy

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

This adds a new column `owner`, whose content is expected to be CONNECTION_ID(),
 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

Run Details

2081 of 2081 relevant lines covered (100.0%)

8.38 hits per line

Jobs

ID	Job ID	Ran	Coverage
1	288.1 (2.1.10)	24 Aug 2016 10:09AM UTC	100.0	Travis Job 288.1
2	288.2 (2.2.5)	24 Aug 2016 10:12AM UTC	100.0	Travis Job 288.2
3	288.3 (2.3.1)	24 Aug 2016 10:12AM UTC	100.0	Travis Job 288.3
4	288.4 (ruby-head)	24 Aug 2016 10:14AM UTC	100.0	Travis Job 288.4

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