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https://issues.apache.org/jira/browse/NIFI-8085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Turcsanyi updated NIFI-8085:
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Status: Patch Available (was: Open)
> Use poll(Duration) in ConsumeKafka_2_x processors
> --------------------------------------------------
>
> Key: NIFI-8085
> URL: https://issues.apache.org/jira/browse/NIFI-8085
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Peter Turcsanyi
> Assignee: Peter Turcsanyi
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The currently used {{KafkaConsumer.poll(long timeout)}} method is deprecated
> in 2.x. The method waits for the metadata response indefinitely until we get
> it (so in case of an unavailable/stopped kafka cluster until the connection
> gets recovered). It means the {{poll(long)}} acquires and holds a thread
> exclusively for this period which can lead to starvation of other processors
> for timer driven threads.
> Use poll(Duration timeout) instead which is not simply an overloaded version
> of the method but has different semantics
> (https://cwiki.apache.org/confluence/display/KAFKA/KIP-266%3A+Fix+consumer+indefinite+blocking+behavior).
> If can return from metadata fetch after the timeout expires and does not
> occupy a thread continuously and makes the processor able to yield.
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