Hi Brandon, Which version of Kafka are the consumers running? My understanding is that if they're running a version lower than the brokers then they could be using a different format for the messages which means the brokers have to convert each record before sending to the consumer. Thanks, Jamie
-----Original Message----- From: Brandon Barron <brandon.bar...@live.com> To: users@kafka.apache.org <users@kafka.apache.org> Sent: Thu, 30 Jan 2020 16:11 Subject: High CPU in 2.2.0 kafka cluster Hi, We had a small cluster (4 brokers) dealing with very low throughput - a couple hundred messages per minute at the very most. In that cluster we had a little under 3300 total consumers (all were kafka streams instances). All broker CPUs were maxed out almost consistently for a few weeks. We switched traffic to a new cluster eventually. The old cluster sitting idle for a few days was at ~40% CPU, with consumers still running. When I took down all the consumers, the idle CPU on the brokers went to about 4%. To test, we decided to mirror active traffic in our new cluster to the old cluster (which now has no running consumers). The CPU didn't budge; it's still at ~4% as expected with the low throughput. One more thing to add: I ran a thread profiler on a couple brokers when the old cluster was taking active traffic with running consumers and the CPU was maxed out. Each time, I saw the ReplicaFetcherThread eating up around 40% of CPU time. Can you give any advice on what might be the root cause of this? Thanks, Brandon
