BigData / Apache Hudi Interview Questions
What is the Hudi timeline?
The timeline is an ordered log of every action ever performed on a Hudi table — commits, delta commits, cleans, compactions, clusterings, rollbacks, and savepoints — each recorded as an instant with a monotonically increasing timestamp.
Each instant moves through states — requested → inflight → completed — and only completed instants are visible to readers, which is what gives Hudi its ACID guarantees and snapshot isolation on plain object storage. The timeline is also the backbone of time-travel and incremental queries, since a reader can simply ask for everything that happened after a given instant.
The timeline records table actions as:
Readers only ever see instants in which state?
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