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A Hudi `timeline instant` consists of the following components

• def~instant-action: Type of action performed on the def~table
• def~instant-time: typically a timestamp (e.g: 20190117010349), which monotonically increases in the order of action’s begin time.
• instant state: current state of the 135861679
• Each instant also has metadata either in avro or json format, that describes in detail the state of the action, at its state on that instant time