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The Design Philosophy of Kuroko2
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Naoto Takai
January 18, 2017
Programming
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The Design Philosophy of Kuroko2
Internal lightning talks in Cookpad
Naoto Takai
January 18, 2017
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Transcript
The Design Philosophy of
• Web-based (not “enterprisy”) • Embedded workflow engine (ruote). •
Distributed architecture • with on demand EC2 provisioning. • communicates with message queue. Kuroko1
kuroko-console RabbitMQ kuoko-worker workflow engine worker process EC2 API launch
exec command web interface web workflow Kuroko1 Overview
kuroko-console RabbitMQ kuoko-worker workflow engine worker process EC2 API launch
exec command web interface web workflow Kuroko1 Pitfalls × × × × × × × × × ×
• It’s really hard to isolate the problem in a
distributed environment. • “Programmable” means programming is always needed. • Nothing is reliable except MySQL. Lessons from Kuroko1
There is data inconsistency between the actual state and the
stored state. Lessons from Kuroko1 (cont.)
State management is a key factor.
• Monolithic is the best. • Data oriented, not process
oriented. • Monitor as possible. Kuroko2
Monolithic Architecture kuroko-console kuoko-worker workflow engine worker process exec command
web interface DB
Kuroko2 Job State job_definitions job_instances tokens noop noop noop noop
/0-noop A job definition A launched job A job state
it do engine.process(token) expect(token.path).to eq '/0-noop' engine.process(token) expect(token.path).to eq '/1-noop'
engine.process(token) expect(token).to be_finished expect(Kuroko2::Token.all.count).to eq 0 end
Kuroko2 Execution State kuroko-worker kuroko-console executions workflow-processor command-executor exec command
loop do execution = Execution.unstarted.take() execution.touch(:started_at) execute_shell(execution.shell) execution.update(exit_status: exit_status, finished_at:
Time.current) execution.finish() end
kuroko-worker kuroko-console executions workflow-processor command-executor exec command Kuroko2 Pitfalls ×
× ×
Kuroko2 Worker Processes command-executor kill process monitor process shell process
exec command
def check_assignment_delay(exec_no_pid) if exec_no_pid.started_at < 1.minutes.ago Kuroko2::Notifications .not_assigned(exec_no_pid, @hostname).deliver_now exec_no_pid.touch(:mailed_at)
end end
def check_process_absence(execution) begin Process.kill(0, execution.pid) rescue Errno::EPERM true rescue Errno::ESRCH
if Execution.exists?(execution.id) notify_process_absence(execution) end end end
• /v1/stats/waiting_execution • /v1/stats/instance Kuroko2 Monitoring API
• State management is a key factor: • monolithic is
the best. • data oriented, not process oriented. • monitor as possible. Kuroko2
is open source product. We are waiting your contributions!