KAFKA-6225: Adds an option to consume continuously

[astubbs]

No description provided.

[astubbs]

IMO this should actually be the default behaviour but it’s an “interface” change. This or setting the timeout to max int and exposing it as configurable.

[astubbs]

I think the build failed on jenkins due to this infinite loop warning from FindBugs: https://builds.apache.org/job/kafka-pr-jdk8-scala2.12/8934/findbugsResult/ . And indeed it is an infinite loop by design.
The other option could be to make the timeout in ConsumerPerformance configurable at the cli... Atm it’s hard coded to stop consuming if their haven’t been any new messages in 1 second.

[astubbs]

It was pointed out the old consumer code path was invalid due to the iterator pattern that I hadn''t noticed (as opposed to the new consumer poll pattern). It's an option to just remove it from the old consumer code path.

[rootex-]

Please check out this PR #4818, gonna be merged soon. And KIP-281: https://cwiki.apache.org/confluence/display/KAFKA/KIP-281%3A+ConsumerPerformance%3A+Increase+Polling+Loop+Timeout+and+Make+It+Reachable+by+the+End+User , and also https://issues.apache.org/jira/browse/KAFKA-6743

[themaxempire23]

Hello is this still an issue?

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