KubeCon + CloudNativeCon Europe 2018

As serverless applications grow more complex, function _composition_, or the ability for functions to call each other, becomes important. This talk will dive into three different approaches to compose FaaS functions together to form large applications:

_Coordinating Functions_ are functions that manage the execution of other functions by calling them directly.

_Event-driven Composition_ uses functions emitting and reacting to events on message queue topics.

_Workflows_ introduce a mechanism for expressing a graph of function interactions and having a new runtime to manage the execution of these functions.

We'll give examples and live demos for each approach, and compare then on the basis of expressiveness, performance, and fault-tolerance; and also on the basis of operational concerns, such as the ease of doing upgrades, and monitoring the overall application's performance.