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course: ksqlDB 101

ksqlDB Code Lifecycle

2 min
Allison

Allison Walther

Integration Architect (Presenter)

Robin Moffatt

Robin Moffatt

Principal Developer Advocate (Author)

Version ksqlDB Applications with ksql-migrations

It would be nice to be able to deploy an application once and be done with it, but that's not realistic: business requirements change, use cases change, and bugs are discovered. You need to be able to manage changes to your applications in a way that's easy to automate.

ksql-migrations is a command-line tool for managing ksqlDB applications, either manually or with scripts:

echo 'CREATE TABLE users ( \
  name STRING, registration_date TIMESTAMP \
) WITH (kafka_topic=’users’, value_format=’json’ \
);' > V000001__create_users.sql

You can define changes to your ksqlDB artifacts in a text file, which can be put under source control. Then you can apply the changes in an ordered sequence to bring your applications up to date:

echo 'ALTER TABLE users ADD COLUMN \
  userid INT;' > V000002__create_users.sql

You can also see the status of all of the changes to monitor, which changes have been applied, and which changes are still waiting to be applied:

ksql-migrations -c config.properties info

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Total 28

  1. Introduction to ksqlDB
    2 min
  2. Interacting with ksqlDB
    2 min
  3. Hands On: Interacting with ksqlDB
    5 min
  4. Creating, Exporting, and Importing Data
    2 min
  5. Filtering with ksqlDB
    1 min
  6. Hands On: Filtering with ksqlDB
    1 min
  7. Lookups and Joins with ksqlDB
    2 min
  8. Hands On: Lookups and Joins with ksqlDB
    2 min
  9. Transforming Data with ksqlDB
    2 min
  10. Hands On: Transforming Data with ksqlDB
    2 min
  11. Flatten Nested Records with ksqlDB
    1 min
  12. Hands On: Flatten Nested Records with ksqlDB
    2 min
  13. Converting Data Formats with ksqlDB
    2 min
  14. Hands On: Converting Data Formats with ksqlDB
    2 min
  15. Merging Two Streams with ksqlDB
    1 min
  16. Hands On: Merging Two Streams with ksqlDB
    2 min
  17. Splitting Two Streams with ksqlDB
    2 min
  18. Hands On: Splitting Two Streams with ksqlDB
    2 min
  19. Streams and Tables
    2 min
  20. Stateful Aggregations (Materialized Views)
    2 min
  21. Hands On: Stateful Aggregations (Materialized Views)
    2 min
  22. Push Queries and Pull Queries
    2 min
  23. Hands On: Push Queries and Pull Queries
    2 min
  24. Under the Covers of ksqlDB
    2 min
  25. ksqlDB Code Lifecycle
    2 min
  26. Apply Lambda Functions to Arrays and Maps
    2 min
  27. Hands On: Apply Lambda Functions to Arrays and Maps
    2 min
  28. Monitoring ksqlDB
    1 min

Related Resources

Presentation

Inside ksqlDB

Blog

ksqlDB Lambda Functions and ksql-migrations Release Blog

Docs

Manage Metadata Schemas

Docs

Migrations Tool Configuration

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ksqlDB Code Lifecycle

Hi, I'm Allison Walther with Confluent. As much as we'd like to think that once an application is deployed, we're done, we know that's not the case. Business requirements will change, new use cases will evolve, and there may even be a bug or two found at some point. We need to be able to manage changes to our applications, preferably in a way that's easy to automate. For this, we have ksql-migrations. Ksql-migrations is a command-line tool that allows us to manage our ksqlDB applications, manually or in a scripted fashion. We can define changes in our ksqlDB artifacts in a text file that can be checked into source control. Then we apply those changes in an ordered sequence to bring our applications up to the current state. Changes are stored in versioned files and they'll be applied in version order, so we can apply all un-applied change files, the next file only, or a range of change files. We can also see the status of all the changes to monitor, which changes have been applied, and which changes are still waiting to be applied. That's it for ksql-migrations.