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savepoint

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Where a Kafka to Iceberg pipeline stops being exactly-once: Flink 1.20, Iceberg 1.10, Kafka 4.3 and Trino 478 in Docker Compose. Turning off exactly-once checkpointing changed nothing; an old savepoint froze the table for 60 seconds at zero consumer lag, then committed 12,000 duplicates; checkpoint interval sets file size, not target file size.

  • Updated Aug 22, 2026
  • Python

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