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Being Reactive is Good
Kevin Webber, Enterprise Advocate, Lightbend
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
Problem?
» we used the right tools to build the wrong thing
Problem?
» we used the right tools to build the wrong thing
» proactive isn't always good
Problem?
» we used the right tools to build the wrong thing
» proactive isn't always good
» reactive isn't always bad
What is reactive
What is reactive
What is reactive
What is reactive
What is reactive
» let principles guide our
» design
» tool selection
» implementation choices
» let principles guide our
» design
» tool selection
» implementation choices
» principles should be accessible and universal
» let principles guide our
» design
» tool selection
» implementation choices
» principles should be accessible and universal
» principles should help people
» reactive helps engineers, lines of business, and
enterprises to capture opportunities
Whatis Reactive?
asynchronous, non-blocking, real-time, highly-
available, loosely coupled, scalable, fault-tolerant,
concurrent, reactive, event-driven, push instead of
pull, distributed, low latency, high throughput...
asynchronous, non-blocking, real-time, highly-
available, loosely coupled, scalable, fault-tolerant,
concurrent, reactive, event-driven, push instead of
pull, distributed, low latency, high throughput...
Too complicated. We need a simple vocabulary.
What is reactive
What is reactive
Overview
» Lagom - Microservices
framework
» Play - RESTful API
framework
» Akka - Distributed
computing toolkit
» Spark - General purpose
compute engine
AkkaUsers
Reactive Principles
Message-driven
» Akka provides all of the
building blocks of reactive
systems
» distribution
» location transparency
» isolation
Resilient
» supervision
Resilient
» dedicated separate error
channel
Resilient
» location transparency
» remoting and clustering
» references are stable
Resilient
» location transparency
» senders can still emit
events even when actors
move from one location
to another
Elastic
» scale up
» async
» non-blocking
» scale out
» immutable data
» share nothing
Responsive
» responsive to events
» events within the business (existing customers)
» events in the market (new opportunity)
» responsive to technology
» load, failure
» emerging technologies (reactive architecture)
» responsive to users
» responsive
a request for service is always answered, even
when failures occur
» elastic
services scale up and down on demand
» resilient
services recover from failures
» message driven
services respond to the world, not attempt to
control what it does
Howdowe build reactive
systems?
Applying the Reactive principles to build a fully
reactive microservices system, using:
» The Lightbend Reactive Platform
» Third-party tools
» Existing infrastructure (hybrid-cloud, etc)
What is reactive
FastData
Architecture
» Akka Streams
» 1-10 second latency per-
event processing
» Spark Streaming
» 10+ second mini-batch
event processing
» Streams become the glue of
the organization
Heritage
Modernization
» Carve up a monolith
» Akka and Play are general
purpose, powerful toolkits
well suited to enterprise
environments
» Java, Scala, JVM
MSA
» Push-streaming or pub-sub
for service-to-service
messaging
» API gateway in front of the
MSA for consumers
» Aggregation
» Authentication/
authorization
» Protocol conversion
» Etc
Thankyou!
Kevin Webber
Medium: medium.com/@kvnwbbr
Twitter: @kvnwbbr
Point of contact
david.loder@lightbend.com
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