Guozhang Wang created KAFKA-9039:
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Summary: Optimize replica fetching CPU utilization with large
number of partitions
Key: KAFKA-9039
URL: https://issues.apache.org/jira/browse/KAFKA-9039
Project: Kafka
Issue Type: Improvement
Components: core
Reporter: Guozhang Wang
Our current follower replica fetching logic has huge CPU cost with
num.partitions to fetch from, and it scales non-linearly as well. There are a
bunch of optimizations we can consider to try to reduce its cost and hopefully
make it to be linear against the num.partitions.
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