Apache Flink Checkpoint Configuration Guide
Prerequisites
Exactly Once Processing
For exactly once semantics to work properly:
Source systems: Must support data retransmission (e.g., message queues like Kafka, distributed file systems like HDFS)
Sink systems: Must support idempotent operations (e.g., Doris supports deduplication)
At Least Once Processing
For at least once semantics:
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Posted on Thu, 07 May 2026 06:14:41 +0000 by smpdawg