"Last Across the Finish Line" is an example application that uses the Task Queue API to showcase a pattern for tracking asynchronous batch workers and notifying a user when all the workers have completed.

This was described in detail in a three part blog post from one of the Google App Engine team members.

The pipeline API is a higher level way to orchestrate task queues (this has been merged since in the mapreduce API we ship with the SDK).

There is also a third-party library -- fantasm -- for doing similar task queue orchestration.

• App Engine

• Python

• NDB Datastore API
• Task Queue API
• Deferred Libary
• Channel API
• Users API
• Datastore Transactions

• webapp2
• jinja2
• jQuery