How to Fix the TypeError When Writing JSON to Pub/Sub Topic Using Apache Beam in Python

Encountering a `TypeError` while trying to write to a Pub/Sub topic in Apache Beam? This guide explains how to resolve the issue step by step.
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Solving the TypeError in Apache Beam: Writing to Pub/Sub

If you're working with Apache Beam in Python and attempting to write JSON data to a Pub/Sub topic, you might encounter a TypeError that can halt your progress. In this guide, we’ll unravel the issue and provide a clear solution to ensure that your data pipelines function smoothly.

The Problem: Error Encountered

While building your data pipeline, you may have used a code snippet like the one below to read from a Pub/Sub topic, perform some transformations, and then write to another Pub/Sub topic:

[[See Video to Reveal this Text or Code Snippet]]

However, you received the following error message:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that there's a typographical error in your pipeline stage for writing to the Pub/Sub.

The Solution: Correcting the Typo

The main issue stems from using a pipe symbol (|) instead of the correct operator (>>) in the last step of your pipeline. The Apache Beam syntax requires that each transformation step is connected with the >> operator, which signifies that one PTransform feeds into another.

Here’s the corrected code:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes:

Operator Correction: Changed the | operator to >> in the line where you write to the Pub/Sub.

Conclusion

By simply correcting the operator used in your Apache Beam pipeline, you can resolve the TypeError you encountered. Apache Beam’s syntax is critical to ensuring that data flows correctly from one transformation stage to the next. Always double-check your operators when facing similar issues!

With this solution, you can now proceed with your data processing task without setbacks. Happy coding!