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Commit Log

Explore the concept of the commit log in Kafka to understand how immutable, ordered records support scalable data pipelines. This lesson helps you grasp how commit logs enable system state recovery, improve performance, and maintain reliability across distributed architectures.

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Kafka is based on the concept of a commit log. Understanding the design and concept of the commit log will help us understand Kafka better. A commit log is a sequence of records where each record has its own unique identifier. There are some characteristics of a commit log that differentiate it from other kinds of logs and storage:

  • Records can only be appended at the end of a commit log.
  • Records are immutable (can’t be modified).
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