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BUILDING REACTIVE SYSTEMS WITH
LAMBDA
hi, my name is Yan Cui
@theburningmonk
“as a Software Engineer,
what is my job?”
“to write code, of course!”
- Me, circa 2006
“to provide value to users &
stakeholders”
- Me, 2016
- Dan North
“lead time to someone saying
thank you is the only reputation
metric that matters.”
THE
BALANCE
COMPETING
FORCES
performance
security
scalability
simplicity
cost
team
time to market
“Programmers know
the benefits of
everything and the
tradeoffs of nothing.”
- Rich Hickey
https://www.infoq.com/presentations/Simple-Made-Easy
context is the king
ONLY ONE ZLATAN
security
complexity
OUTSIDE the code
deployment
load balancing
caching
monitoring
config management
https://www.infoq.com/presentations/complexity-simplicity-esb
centralised logging
elastic scaling
setup server
Leaky Abstraction
AWS re:invent 2014https://www.youtube.com/watch?v=9eHoyUVo-yg
AWS re:invent 2014https://www.youtube.com/watch?v=9eHoyUVo-yg
FAAS
(Function-As-A-Service)
THERE IS NO SERVER
cost saving
charged by
invocations
not paying for
idle servers
elastic scaling
hi guys,
come back at 10 to find
out who won!
everyone
came back at
exactly 10pm!
everyone
came back at
exactly 10pm!
Lambda scaled
instantly
these spikes happen to us
ALL THE TIME
minimise
undifferentiated
heavy-lifting
“what about containers?”
important, but
invisible subsystems
economy of scale
NoOps!!
reactive
simple, fast
deployment
first Lambda function went live
(team size : 4)
(team size : 7)
155 prod deployments!
- Dan North
“lead time to someone saying
thank you is the only reputation
metric that matters.”
easy to get
started
now, we stand at 130 Lambda
functions in prod, with 170 in dev
fuelling
the Yubl
platform
evolution
My Beautiful Monolith
“What would a good
architecture for us look like?”
small, incremental deployments
fast deployments
no downtime
no lock-step deployments
features deployed independently
features loosely-coupled through messages
minimise cost for unused resources
minimise ops effort
oh, and do all these whilst continue
to deliver value, thanks :-)
love, your users
completely rebuilt search
Legacy Monolith Amazon Kinesis Amazon Lambda
Amazon CloudSearch
Legacy Monolith Amazon Kinesis Amazon Lambda
Amazon CloudSearchAmazon API Gateway Amazon Lambda
analytics pipeline
Legacy Monolith Amazon Kinesis Amazon Lambda
Google BigQuery
Legacy Monolith Amazon Kinesis Amazon Lambda
Google BigQuery
1 developer, 2 days
design production
(his 1st serverless project)
Legacy Monolith Amazon Kinesis Amazon Lambda
Google BigQuery
“nothing ever got done
this fast at Skype!”
- Chris Twamley
- Dan North
“lead time to someone saying
thank you is the only reputation
metric that matters.”
Rebuilt
with Lambda
Rebuilt
with Lambda
and many more…
“JavaScript doesn’t scale
well with complexity”
- People on the Internet
but
“limit complexity, and
JavaScript isn’t so bad”
- Me
TESTING
amzn.to/29Lxuzu
Level of Testing
1.Unit
do our objects do the right thing?
are they easy to work with?
Level of Testing
1.Unit
2.Integration
does our code work against code we
can’t change?
handler
handler
test by invoking
the handler
Level of Testing
1.Unit
2.Integration
3.Acceptance
does the whole system work?
Level of Testing
unit
integration
acceptance
Level of Testing
unit
integration
acceptance
can do all 3 with Lambda
“…We find that tests that mock external
libraries often need to be complex to
get the code into the right state for the
functionality we need to exercise.
The mess in such tests is telling us that
the design isn’t right but, instead of
fixing the problem by improving the
code, we have to carry the extra
complexity in both code and test…”
Don’t Mock Types You Can’t Change
“…The second risk is that we have to be
sure that the behaviour we stub or mock
matches what the external library will
actually do…
Even if we get it right once, we have to
make sure that the tests remain valid
when we upgrade the libraries…”
Don’t Mock Types You Can’t Change
Don’t Mock Types You Can’t Change
Services
“…Wherever possible, an acceptance
test should exercise the system end-to-
end without directly calling its internal
code.
An end-to-end test interacts with the
system only from the outside: through
its interface…”
Testing End-to-End
Legacy Monolith Amazon Kinesis Amazon Lambda
Amazon CloudSearchAmazon API Gateway Amazon Lambda
Legacy Monolith Amazon Kinesis Amazon Lambda
Amazon CloudSearchAmazon API Gateway Amazon Lambda
Test Input
Legacy Monolith Amazon Kinesis Amazon Lambda
Amazon CloudSearchAmazon API Gateway Amazon Lambda
Test Input
Validate
“…We prefer to have the end-to-end
tests exercise both the system and the
process by which it’s built and
deployed…
This sounds like a lot of effort (it is), but
has to be done anyway repeatedly
during the software’s lifetime…”
Testing End-to-End
Jenkins build config deploys and tests
unit + integration tests
deploy
acceptance tests
build.sh allows repeatable builds on both local & CI
LOGGING
2016-07-12T12:24:37.571Z 994f18f9-482b-11e6-8668-53e4eab441ae
GOT is off air, what do I do now?
2016-07-12T12:24:37.571Z 994f18f9-482b-11e6-8668-53e4eab441ae
GOT is off air, what do I do now?
UTC Timestamp API Gateway Request Id
your log message
organised by Function + Version
LOG OVERLOAD
centralise your logs
CloudWatch Logs AWS Lambda
LogStash ElasticSearch
CloudWatch Logs AWS Lambda
LogStash ElasticSearch
AWS Elasticsearch
CloudWatch Logs AWS Lambda
LogStash ElasticSearch
AWS Elasticsearch
Elastic Cloud
CloudWatch Logs AWS Lambda
LogStash ElasticSearch
AWS Elasticsearch
Elastic Cloud
?
correlation IDs
MONITORING
nowhere to install
monitoring agents
no time for
background tasks
• Invocation Count
• Error Count
• Latency (avg, min, max, sum)
• Throttling
• Granular to the minute
• Support custom metrics
• Same basic metrics
• Better dashboard
• Support custom metrics
https://www.datadoghq.com/blog/monitoring-lambda-functions-datadog/
Do It Yourself
PRO TIP
set up dashboards
PRO TIP
don’t forget to set
up alarms
PRO TIP
add application-level
metrics
KEEP
WARM
functions are unloaded if
idle for a while
noticeable cold start time
(package size matters)
CloudWatch Event AWS Lambda
CloudWatch Event AWS Lambda
ping
ping
ping
ping
CloudWatch Event AWS Lambda
ping
ping
ping
ping
CloudWatch Event AWS Lambda
ping
ping
ping
ping
HEALTH CHECKS?
KNOW YOUR LIMITS
max 50 MB deployment package size
max 50 MB deployment package size
max 75 GB total deployment package size*
* limit is per AWS region
Janitor Monkey
Janitor Lambda
max 5 mins execution time
max 6 MB request payload size*
max 6 MB response payload size
* for a request-response event type
default max 100 concurrent executions*
* soft-limit, can be raised via support ticket
looking ahead
.Net core?
SQS support?
v1.0
MULTI-CLOUD
FUTURE?
IBM OpenWhisk
Amazon Lambda Azure Web Functions
Google Cloud Functions
competition
faster innovation
lower prices
@theburningmonk
@theburningmonk
theburningmonk.com
github.com/theburningmonk
@theburningmonk
@theburningmonk
theburningmonk.com
github.com/theburningmonk
slides at http://bit.ly/2ecqEql

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