[KAFKA-13679] Superfluous node disconnected log messages

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.1.0
• Component/s: clients
• Assignee: Unassigned
• Reporter: Philip Bourke
• Created: 21/Feb/22 23:28
• Updated: 18/Jun/24 12:42

Description

In Kafka 3.1 the "Node x disconnected" log message in the NetworkClient.java class was changed from DEBUG to INFO - https://github.com/apache/kafka/commit/79d97bd29d059e8ba8ee7726b49d76e03e281059#diff-dcc1af531d191de8da1e23ad6d878a3efc463ba4670dbcf2896295a9dacd1c18R935

Now my application logs are full of node disconnected messages and it would indicate that there may be a connectivity problem. However I can see that the logs are getting written every 5 minutes exactly, and it's the AdminClient that is writing the logs.

2022-02-16 14:45:39,277 [d-60105f051cdb-admin] INFO   o.apache.kafka.clients.NetworkClient - [AdminClient clientId=desktop-session-internal-user-streamer-v1-9888ff1d-446e-40cd-88dd-60105f051cdb-admin] Node 1 disconnected.

My guess is that it may be the connections.max.idle.ms config setting, and there is in fact no issue with connectivity to the brokers?

I'm raising this ticket here because the logs are full of these repetitive messages indicating an issue and setting off alarm bells, and also because I did not get a response on the confluent forum or in any slack channels.

Issue Links

• is duplicated by: KAFKA-14080 too many node disconnected message in kafka-clients