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# The Python Mapreduce API

#### Experimental!

Mapreduce is an experimental, innovative, and rapidly changing new feature for App Engine. Unfortunately, being on the bleeding edge means that we may make backwards-incompatible changes to Mapreduce. We will inform the community when this feature is no longer experimental.

Welcome to the Mapreduce API for App Engine!

The Mapreduce API is described in the following sections:

- Overview
- Hello World
- Reference
  - Mapreduce Pipeline
  - Standard Input Readers and Output Writers