Page History

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At its core, Hudi maintains a timeline of all actions performed on the dataset at different instants of time that helps provide instantaneous views of the dataset, while also efficiently supporting retrieval of data in the order of arrival. A Hudi `timeline instant` consists of the following components

• Instant instant action type: Type of action performed on the datasetInstant
• instant time : Instant time is typically a timestamp (e.g: 20190117010349), which monotonically increases in the order of action’s begin time.
• Instant state instant state: current state of the timeline instant

Design decisions

1. Hudi guarantees that the actions performed on the timeline are atomic & timeline consistent based on the instant time.

Key Instant action types performed include:

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Design decisions

1. #todo

Related concepts

1. file format
2. commit

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