Lianet Magrans created KAFKA-18071:
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Summary: Avoid unneeded background event to refresh regex if no
subscription pattern in use
Key: KAFKA-18071
URL: https://issues.apache.org/jira/browse/KAFKA-18071
Project: Kafka
Issue Type: Improvement
Components: clients, consumer
Reporter: Lianet Magrans
Assignee: Lianet Magrans
Fix For: 4.0.0
With the new consumer, the poll loop currently generates an
UpdatePatternSubscriptionEvent on each poll iteration, that is processed in the
background to re-eval the subscription regex against the latest metadata (if
there is new metadata).
If the consumer is not subscribed to a pattern, we still generate this event,
and early return in the background thread if !hasSubscriptionPattern. We should
consider short-circuiting this on the app thread, to avoid generating the event
and blocking on it's processing if not needed.
Note that checking subscription.hasSubscriptionPattern in the app thread should
be safe given that it changes only triggered from the app thread, when calling
subscribe(Pattern), which blocks until the subscription state is updated.
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