Documentation

Overview

    debugging_wordcount is an example that verifies word counts in Shakespeare and includes Beam best practices.

    This example, debugging_wordcount, is the third in a series of four successively more detailed 'word count' examples. You may first want to take a look at minimal_wordcount and wordcount. After you've looked at this example, then see the windowed_wordcount pipeline, for introduction of additional concepts.

    Basic concepts, also in the minimal_wordcount and wordcount examples: Reading text files; counting a PCollection; executing a Pipeline both locally and using a selected runner; defining DoFns.

    New Concepts:

    1. Using the richer struct DoFn form and accessing optional arguments.
    2. Logging using the Beam log package, even in a distributed environment
    3. Testing your Pipeline via passert
    

    To change the runner, specify:

    --runner=YOUR_SELECTED_RUNNER
    

    The input file defaults to a public data set containing the text of of King Lear, by William Shakespeare. You can override it and choose your own input with --input.