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Overview The Google App Engine Pipeline API connects together complex, time-consuming workflows (including human tasks). The goals are flexibility, workflow reuse, and testability. A primary use-case of the API is connecting together various App Engine MapReduces into a computational pipeline.

Status This is opensource and community supported. Please join the mailing list to ask questions. There are implementations is both Python and Java.

Getting started Read the Getting Started guides for Python and Java to learn about the Pipeline API Read the javadoc Look at the Python Demo and Demo code and the Java Demo and Demo code, which lets you explore the debugging console Check out the library and include it in your project Look at example common Pipelines that are reusable Screenshots The Pipeline library includes a UI for debugging, including:

Status of the pipeline Values of all parameters and returned values Spawned children Status message and links to consoles

Here is an example of a pipeline in-flight with example console:

A Pipeline where all elements have completed