Extract Product Lines
To do effective legacy displacement, we need to figure out how to break down the problem into manageable pieces. Extract Product Lines does this by identifying product lines and using…
Patterns of Legacy Displacement
My colleagues do a lot of work that involves replacing legacy software systems. Three of my colleagues – Ian Cartwright, Rob Horn, and James Lewis – have started to capture…
Follower Reads
When you are using Leaders and Followers, you can use Follower Reads to achieve better throughput and lower latency. However there is always a replication lag between the leader and…
Stepping Back from Speaking
A personal note on why I wish to give up doing talks more… Source: martinfowler
Version Vector
A Lamport Clock is effective to order events on a single server, but with multiple servers we need a vector of version numbers to detect concurrent updates. more… Source: martinfowler
Lamport Clock
Next distributed system pattern from Unmesh is the Lamport Clock. Distributed systems can’t assume that time is consistent between servers, and sometimes time goes backwards. Yet it’s important to have…
Hybrid Clock
While a Lamport Clock is often necessary to order events in a distributed system, clients often need to know the actual times too. The Hybrid Clock, Unmesh’s next pattern, combines…
Versioned Value
When a distributed system has mutable data, nodes need to know which is the most recent value, so a versioned value stores a version number with every value. more… Source:…