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https://issues.apache.org/jira/browse/NIFI-2078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397203#comment-15397203
]
ASF GitHub Bot commented on NIFI-2078:
--------------------------------------
Github user ijokarumawak commented on a diff in the pull request:
https://github.com/apache/nifi/pull/563#discussion_r72577880
--- Diff:
nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-pubsub-processors/src/main/java/org/apache/nifi/processors/kafka/pubsub/ConsumeKafka.java
---
@@ -54,7 +72,12 @@
@InputRequirement(Requirement.INPUT_FORBIDDEN)
@CapabilityDescription("Consumes messages from Apache Kafka")
@Tags({ "Kafka", "Get", "Ingest", "Ingress", "Topic", "PubSub", "Consume"
})
-public class ConsumeKafka extends AbstractKafkaProcessor<Consumer<byte[],
byte[]>> {
+@Stateful(scopes = {Scope.EXTERNAL}, description = "After consuming
messages, ConsumeKafka commits its offset information to Kafka" +
+ " so that the state of a consumer group can be retained across
events such as consumer reconnect." +
+ " Offsets can be cleared when there is no consumer subscribing
with the same consumer group id." +
+ " It may take more than 30 seconds for a consumer group to become
able to be cleared after it is stopped from NiFi." +
+ " Once offsets are cleared, ConsumeKafka will resume consuming
messages based on Offset Reset configuration.")
+public class ConsumeKafka extends AbstractKafkaProcessor<Consumer<byte[],
byte[]>> implements ExternalStateManager {
--- End diff --
Added documentation in Developer Guide.
> State management for processors whose states are managed externally
> -------------------------------------------------------------------
>
> Key: NIFI-2078
> URL: https://issues.apache.org/jira/browse/NIFI-2078
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Koji Kawamura
> Assignee: Koji Kawamura
> Fix For: 1.0.0
>
>
> Inherently by the nature of a given processor it may involve state managed by
> itself (using nifi state management), or can be managed by some external
> service it interacts with (kafka's offset), and theoretically some might have
> both going on. With the new state management, we're giving users a way to
> reset state managed by nifi for a given processor. But it doesnt apply to
> those processors who have external state.
> we should consider offering a way to reset state that allows a processor to
> call out to whatever external store it impacts
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