This document introduces Koyomi, an open source cron-like job scheduler for Perl. Koyomi allows jobs to be scheduled and run across multiple worker servers/processes to provide high availability. It keeps jobs and their execution separate, with each worker able to run any job by acquiring a mutex first. The architecture is explained where all workers share the same job datastore. Requirements are Perl 5.10.1+ and supported databases include MySQL and SQLite. Usage involves adding, listing, modifying and deleting jobs via the koyomi-cli command line interface. A tutorial is available on installing and running Koyomi with Systemd on CentOS 7. The creator applied to demonstrate Koyomi at the YAPC

1. Introduction to Koyomi
#appkoyomi
@key_amb
In Gotanda.pm #5

2. Who am I ?
❏ @key_amb
❏ Software Engineer
❏ Serverside, Web, Ops, Admin
❏ https://github.com/key-amb
❏ https://metacpan.org/author/KEYAMB

3. What is “Koyomi” ?
❏ https://github.com/key-amb/perl5-App-Koyomi
❏ Documentation - http://key-amb.github.io/App-
Koyomi-Doc/
❏ cron like Job Scheduler
❏ Jobs’ datastore is separate from its
executors
❏ Latest release - v0.5.2 (at Jun. 26, 2015)

4. Architecture of Koyomi
Jobs
worker A
worker B

5. Architecture of Koyomi
Jobs
worker A
worker B
Exec Job 1
Can’t exec Job 1

6. Architecture of Koyomi
❏ In one Koyomi Cluster,
❏ Every worker has the same Jobs’ Datastore
❏ Each Job is executed by only one worker at once
❏ How does Koyomi do that?
❏ Each worker tries to acquire the mutex of the job
beforehand
❏ Only one successful worker can acquire it
❏ Then he will run the job

7. Requirements
❏ Perl v5.10.1 or later
❏ Supported Datastore:
❏ MySQL
❏ SQLite … No Redundancy

8. koyomi-cli
❏ For CRUD of Jobs
koyomi-cli add # Create
koyomi-cli list # Read
koyomi-cli modify -id X # Update
koyomi-cli delete -id X # Delete

9. Koyomi Tutorial (Japanese Only)
❏ Koyomi を CentOS 7 にインストールし、
Systemd で動かす - Qiita (Jun. 21, 2015)

10. YAPC::Asia Tokyo 2015
❏ Applied for a Talk:
Koyomi - A Simple Distributed Job
Scheduler for High Availability

11. DEMO

12. Thank you!