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[KAFKA-8736] Performance: ThreadCache uses size() for empty cache check - Kafka - [issue]
...While load testing Kafka Streams in 2.3.0, we stumbled across a potential performance improvement. The test showed we were spending 80% of CPU time in ConcurrentSkipListMap.size(): 100% org....
http://issues.apache.org/jira/browse/KAFKA-8736    Author: Matthew Jarvie , 2019-08-13, 22:10
[KAFKA-7821] Streams: default cache size can lose session windows in high-throughput deployment - Kafka - [issue]
...We have observed that with a default cache size, a Streams aggregator will sometimes fail to find existing, open session windows while handling records. The effect is that it starts a new se...
http://issues.apache.org/jira/browse/KAFKA-7821    Author: Matthew Jarvie , 2019-01-22, 22:23