Xavier Léauté created KAFKA-8806:
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Summary: Kafka.poll spends significant amount of time in
KafkaConsumer.updateAssignmentMetadataIfNeeded
Key: KAFKA-8806
URL: https://issues.apache.org/jira/browse/KAFKA-8806
Project: Kafka
Issue Type: Bug
Affects Versions: 2.3.0
Reporter: Xavier Léauté
Comparing the performance profile of 2.2.0 and 2.3.0, we are seeing significant
performance differences in the
{{KafkaConumer.updateAssignmentMetadataIfNeeded()}} method.
The call to {{KafkaConsumer.updateAssignmentMetadataIfNeeded()}} now represents
roughly 40% of CPU time spent in {{KafkaConsumer.poll()}}, when before it only
represented less than 2%.
Most of the extra time appears to be spent in
{{KafkaConsumer.validateOffsetsIfNeeded()}}, which did not show up in previous
profiles.
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