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https://issues.apache.org/jira/browse/NIFI-15961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard updated NIFI-15961:
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Status: Patch Available (was: Open)
> Add Kafka Share Group support to ConsumeKafka
> ---------------------------------------------
>
> Key: NIFI-15961
> URL: https://issues.apache.org/jira/browse/NIFI-15961
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Pierre Villard
> Assignee: Pierre Villard
> Priority: Major
>
> Extend the *ConsumeKafka* processor with optional support for Kafka share
> groups
> ([KIP-932|https://cwiki.apache.org/confluence/display/KAFKA/KIP-932%3A+Queues+for+Kafka]).
> Share groups distribute records cooperatively across the consumers of a
> group with per-record acknowledgement, decoupling consumer parallelism from
> the number of partitions on the subscribed topics.
> *Proposed Change*
> Add a new *Group Type* property to *ConsumeKafka* with values *Consumer
> Group* (the default) and {*}Share Group{*}.
> When *Share Group* is selected:
> * The processor uses *KafkaShareConsumer* via a new
> *KafkaShareConsumerService* SPI on *KafkaConnectionService* (added as a
> default method that throws *UnsupportedOperationException* so out-of-tree
> implementations stay binary- and source-compatible).
> * A new *Acknowledgement Mode* property ({*}Explicit{*} default, *Implicit*
> opt-in) controls how records are acknowledged. In *Explicit* mode every
> record is acknowledged individually; on session rollback records are
> {*}RELEASE{*}d back to the share group for immediate redelivery. In
> *Implicit* mode the broker treats all delivered records as *ACCEPT* on the
> next poll/commit; on rollback the consumer is closed so the broker's
> record-acquisition lock can expire and the records become eligible for
> redelivery.
> * Classic-group properties (Topic Format, Auto Offset Reset, Commit Offsets)
> are hidden when *Share Group* is selected because they have no analogue in
> the share-group protocol. The starting position for a new share group is
> managed out of band via *kafka-share-groups.sh --reset-offsets* or
> {*}Admin.alterShareGroupOffsets{*}.
> * Verification and topic sampling continue to use *Explicit* acknowledgement
> internally so sampled records are released back to the share group,
> regardless of the user-selected mode.
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