August 2017
Beginner to intermediate
278 pages
6h 40m
English
book
Building Data Streaming Applications with Apache Kafka
by Chanchal Singh, Manisha Sethi, Manish Kumar, Anshul Joshi
Content preview from Building Data Streaming Applications with Apache Kafka
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Exactly once delivery
Exactly once delivery needs to be understood in the complete messaging system and not only in the producer or consumer context.
Exactly once delivery refers to the semantics that ensures that the broker or consumer receives only one message, irrespective of how many times the producer sends the message. In case of failure, the partially completed steps should either be reverted or the system should store or process messages in a way that duplicates are ignored.
To ensure exactly once delivery, Kafka has provisions for idempotent producers. These kinds of producers ensure that one, and only one, message is written to a Kafka log. This will be irrespective of how many retries happen from producer side.
Idempotent producers ...
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