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How Microservices Fail…
and what to do about it.
Richard Rodger
@rjrodger
github.com/rjrodger/nodezoo
https://aws.amazon.com/message/5467D2/
github.com/rjrodger/nodezoo
github.com/rjrodger/nodezoo
github.com/rjrodger/nodezoo
Pattern Matching
	 Service discovery is an anti-pattern.
	 Instead, make messages first-class citizens.
	 Use message data to define patterns,
	 	 and these patterns define a language!
	
Transport Independence
	 Services should not know about each other,
	 	 or how to send messages.
	 Services are fully defined by:
	 	 message patterns that they recognise, and
	 	 message patterns that they emit.
github.com/rjrodger/nodezoo
// a search message
{
"role": "search", // a namespace
"cmd": "search", // this is a command
"query": "ldap", // some data
}
!
// the pattern to match
role:search,cmd:search
github.com/rjrodger/nodezoo
// some nodezoo message patterns
!
role:search,cmd:search // do a search
role:search,cmd:insert // insert into index
role:info,cmd:get // get module info
role:npm,cmd:get // get npm data
role:npm,info:change // module changed!
role:info,req:part // need module info
role:info,res:part // here's module info
!
!
!
github.com/rjrodger/nodezoo
role:search,cmd:search
role:info,cmd:get
synchronous request/response
github.com/rjrodger/nodezoo
role:npm,info:change
asynchronous "winner-take-all"
(actor)
github.com/rjrodger/nodezoo
role:info,req:part
asynchronous "fire-and-forget"
(publish/subscribe)
role:info,res:part
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
synchronous/
asynchronous
consumed/
observed
github.com/rjrodger/nodezoo
senecajs.org
github.com/rjrodger/nodezoo
code
(branch: msdub201509)
github.com/rjrodger/nodezoo
kintsugi ⾦金継ぎ
(golden joinery)
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
How do these break?
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
github.com/rjrodger/nodezoo
failure mode
"Slow downstream"
B responses are getting slower,
consuming As resources.
mitigation
Drop B.
A should consider B dead.
Or: the transport should handle this.
github.com/rjrodger/nodezoo
failure mode
"Upstream overload"
A is sending messages to B
at a higher rate than B can handle.
mitigation
Back-pressure from B.
A should accept back pressure
notifications and scale back.
Assumes B is doing more work than A.
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
github.com/rjrodger/nodezoo
failure mode
"Lost Actions"
A is sending messages to B,
and C is listening. But perhaps the
latest version of C is broken?
mitigation
Measure message flow rates.
Do the flow ratios match
the business rules?
github.com/rjrodger/nodezoo
failure mode
"Broken Contracts"
A and B are using a newer
message schema,
but you forgot about C.
mitigation
Don't use contracts!
Message schemas are a
net negative and hinder
multi-version deployment.
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
github.com/rjrodger/nodezoo
failure mode
"Poison Message"
A is sending messages that crash B.
B keeps restarting and trying to handle
the poison message. Now nothing works!
mitigation
B should drop out of date messages
on the floor. B should maintain a list of
recently seen messages and ignore duplicates.
B sends bad messages to the "Dead Letter" log.
github.com/rjrodger/nodezoo
failure mode
"Guaranteed Delivery ... ain't"
B expects at-most-once, exactly-one,
or at-least-once delivery of
unique messages. This is not possible.
mitigation
Idempotency.
Where possible, duplicate messages
should have no bad effects.
github.com/rjrodger/nodezoo
asynchronous "fire-and-forget"
(publish/subscribe)
synchronous request/response
asynchronous "winner-take-all"
(actor)
synchronous "sidewinder"
(side effects!)
github.com/rjrodger/nodezoo
failure mode
"Emergent Behaviour"
Strange loops and unexplained
message paths make it hard to understand
what the system is doing.
mitigation
Correlate messages.
Attach correlation identifiers to messages
so that you can trace the flow of causality.
github.com/rjrodger/nodezoo
failure mode
"Catastrophic Collapse"
You've introduced feedback
that grows exponentially.
And you've no idea how to fix it.
mitigation
Have a kill switch.
Microservices aren't a
silver bullet. Sometimes you
need to selectively reboot.
github.com/rjrodger/nodezoo
P( success ) = 1
P( failure ) < ε
vs.
github.com/rjrodger/nodezoo
// apoptosis
setTimeout(function(){
process.exit(0)
}, 60*60*1000*Math.random())
!
!
!
!
!
!
!
!
!
Thanks!
Richard Rodger
@rjrodger

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