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The only metadata retained on a per-consumer basis is the position of the consumer in the log, called __________

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The only metadata retained on a per-consumer basis is the position of the consumer in the log, called __________

(a) offset

(b) partition

(c) chunks

(d) all of the mentioned

The question was posed to me in an international level competition.

I'd like to ask this question from Kafka with Hadoop in chapter Oozie, Orchestration, Hadoop Libraries and Utilities and Miscellaneous Hadoop Applications of Hadoop

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Correct choice is (a) offset

To explain I would say: offset is controlled by the consumer: normally a consumer will advance its offset linearly as it reads messages

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