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Published: Oct 20, 2020 License: Apache-2.0 Imports: 10 Imported by: 0



wordcount is an example that counts words in Shakespeare and includes Beam best practices.

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

For a detailed walkthrough of this example, see


Basic concepts, also in the minimal_wordcount example: Reading text files; counting a PCollection; writing to text files

New Concepts:

  1. Executing a Pipeline both locally and using the selected runner
  2. Defining your own pipeline options
  3. Using ParDo with static DoFns defined out-of-line
  4. Building a composite transform

Concept #1: you can execute this pipeline either locally or using by selecting another runner. These are now command-line options added by the 'beamx' package and not hard-coded as they were in the minimal_wordcount example. The 'beamx' package also registers all included runners and filesystems as a convenience.

To change the runner, specify:


To execute this pipeline, specify a local output file (if using the 'direct' runner) or a remote file on a supported distributed file system.


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.

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