Do metrics for detecting clients from old versions actually exist? Or is Gwen making features up? This and more useful advice is coming up on today's episode of Ask Confluent.

EPISODE LINKS

• The Java property that will refresh DNS cache frequently: java.security.Security.setProperty(“networkaddress.cache.ttl” , “60");
• Improvements to DNS lookups in Confluent Platform 5.1.2 (Apache Kafka 2.1.1):
  • KAFKA-7755
  • KAFKA-7890
• More reasons to upgrade to Confluent Platform 5.1.2
• Monitoring clients with old versions:
  • KIP-188 has lots of important new metrics 
• If you are worried about “down-conversion” as discussed in Ask Confluent #5, you want to monitor: MBean: kafka.server:type=BrokerTopicMetrics,name=FetchMessageConversionsPerSec,topic=([-.\w]+)
• KIP-188 also added a metric for temp memory usage (memory used for conversion and compression) that can be useful
• In KIP-272, we’ve added version tag to request metrics, so you can see how many requests per sec you get from each version
• Recommendations for Kafka Summit NYC
• Watch the video version of this podcast