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In this week’s podcast, Thomas Betts talks with Chris Richardson, a developer, architect, Java Champion and author of POJOs in Action. Before his workshop on Microservices w/ Spring Boot and Docker at QCon San Francisco 2016, Richardson took time to discuss his ideas on how to use DDD and CQRS concepts as a guide for implementing a robust microservices architecture.

Why listen to this podcast:

 - "Microservice architecture" is a better term than "microservices".   The latter suggests that a single microservice is somehow interesting
 - The concepts discussed in Domain-Driven Design are an excellent guide for how to implement a microservices architecture
 - Bounded Contexts correspond well to individual microservices
 - Event sourcing and CQRS provide patterns for how to implement loosely coupled services
 - When converting a monolith to microservices, avoid a big bang rewrite, in favor of an iterative approach

Notes and links can be found on: http://bit.ly/2hZ8TM1

11m:51s - Microservices must be loosely coupled, usually creating a model with one database per service.
12m:45s - There is a business requirement to maintain data consistency across services, and using an event driven architecture is a good way to achieve that.
13m:38s - Event sourcing is specific technique for persisting domain objects as a series of events.
14m:11s - Just as transactions don’t like to be split across microservices, queries cannot simply join across multiple data sources. CQRS provides a solution that accommodates querying via microservices and materialized views.

More on this:
Quick scan our curated show notes on InfoQ. http://bit.ly/2hZ8TM1

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InfoQ Podcast

Show Notes

Chris Richardson on Domain-Driven Microservices Design

In this week’s podcast Wes Reisz talks to Neha Batra, a software engineer at Pivotal Labs. Neha spoke about pair programming in her recent QCon San Francisco 2016 presentation, and has taken time to discuss techniques to get started with the practice as well as tips for implementing it on your team. Neha also touches on vulnerability based trust and how it can help effectively build a trusting team environment.
Why listen to this podcast:

 - If you successfully start with pair programming, other tenants of XP are pulled along with you
 - Ways to get creative with remote pairing to make it work
 - The daily retro
 - Overcoming hesitance with managers when trying to implement pair programming full time
 - Vulnerability based trust building

Notes and links can be found on: http://bit.ly/2i2a0sJ

How has Pair Programming Evolved Over the Years? 

6m:17s - A lot of the fundamentals are the same, but with XP we take it to the extreme to be able to do it  eight hours a day.
6m:24s - To pair for eight hours a day we adapt to a lot of other process to create a simpler way of working, giving us an easier level to default to.
6m:44s - We use phrases in the team to make sure we agree on a test, that there are no false positives, when to refactor etc. This helps us avoid accruing code debt since we don’t do code reviews.

More on this:
Quick scan our curated show notes on InfoQ. http://bit.ly/2i2a0sJ

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Neha Batra - Pivotal Labs Pair Programming

Wesley Reisz talks to Slava Oks, who has worked at Microsoft for over 20 years on flagship products, including SQL Server. He also led the kernel team who worked on the Midori operating system. More recently, he has worked on bringing SQL Server to Linux.

Why listen to this podcast:

 - Microsoft SQL Server runs on Linux through a containerised approach called Drawbridge
 - Drawbridge implements a Linux loader and a minimal set of ABI calls to allow an in-process NT user mode kernel to run
 - SQL Server runs on top of a SQL platform layer (called SQL OS) that could be ported to run on Drawbridge
 - SQL Server had supportability commands added to allow the state of the system to be measured with SQL calls
 - A number of efficiency gains were applied to both the Drawbridge components and the SQL Server code to bring performance to within 20% of the equivalent process running on Windows

Notes and links can be found on: http://bit.ly/2kVfatX

Drawbridge
ABIs
Security
LibOS
Linux
SQL OS
Supportability
Some assembly required
Addressing
Performance

More on this:
Quick scan our curated show notes on InfoQ http://bit.ly/2kVfatX

You can also subscribe to the InfoQ newsletter to receive weekly updates on the hottest topics from professional software development. bit.ly/24x3IVq

Architecting SQL Server on Linux: Slava Oks on Drawbridge, LibOS, & Addressing Between Windows/Linux

Wesley Reisz talks to Daniel Bryant on moving from monoliths to micro-services, covering bounded contexts, when to break up micro-services, event storming, practices like observability and tracing, and more.

Why listen to this podcast:

- Migrating a monolith to micro-services is best done by breaking off a valuable but not critical part first.
 - Designing a greenfield application as micro-services requires a strong understanding of the domain.
 - When a request enters the system, it needs to be tagged with a correlation id that flows down to all fan-out service requests.
 - Observability and metrics are essential parts to include when moving micro-services to production.
 - A service mesh allows you to scale services and permit binary transports without losing observability.

More on this: Quick scan our curated show notes on InfoQ http://bit.ly/2pFYBiT

You can also subscribe to the InfoQ newsletter to receive weekly updates on the hottest topics from professional software development. bit.ly/24x3IVq

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Daniel Bryant on Microservices and Domain Driven Design

On the InfoQ Podcast this week, Wes Reisz talks with the Queen of Patterns, Linda Rising. Linda discusses her thoughts on the importance of patterns, she answers questions about what really is a pattern, and how she became involved in working with them. Throughout the podcast she discusses a variety of organizational and personal patterns and finally wraps with patterns to apply when driving change and innovation.

Why listen to this podcast:

 - You have to realise that there’s nothing you can do about other people. The only person you can affect is yourself.
 - A pattern is not a band-aid that you use once. You use it in a context where you use it in conjunctions with other patterns.
 - Take baby steps when driving change in an organisation, and seek out a pocket of receptive people to drive it.
 - Slack is an important part to have in life, so that if something comes along you can absorb it without having to stop doing something else.
 - Listen, Listen, Listen.

More on this: Quick scan our curated show notes on InfoQ http://bit.ly/2vLIsMC

You can also subscribe to the InfoQ newsletter to receive weekly updates on the hottest topics from professional software development. bit.ly/24x3IVq

Subscribe: www.youtube.com/infoq
Like InfoQ on Facebook: bit.ly/2jmlyG8
Follow on Twitter: twitter.com/InfoQ
Follow on LinkedIn: www.linkedin.com/company/infoq
Want to see extented shownotes? Check the landing page on InfoQ: http://bit.ly/2vLIsMC

Linda Rising on the Importance of Patterns, Her Journey, & Patterns for Driving Change/Innovation

Software engineers, architects and team leads have found inspiration to drive change and innovation in their team by listening to the weekly InfoQ Podcast. They have received essential information that helped them validate their software development map. We have achieved that by interviewing some of the top CTOs, engineers and technology directors from companies like Uber, Netflix and more. Over 1,200,000 downloads in the last 3 years.