Scenario: You are tasked with designing a real-time analytics application using Apache Flink. Which feature of Apache Flink would you utilize for exactly-once processing semantics?

  • Checkpointing
  • Savepoints
  • State TTL (Time-To-Live)
  • Watermarking
Checkpointing in Apache Flink is the feature used for ensuring exactly-once processing semantics. Checkpoints capture the state of the application at regular intervals, allowing Flink to recover from failures and guaranteeing that each record is processed exactly once, even in the presence of failures or restarts.
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