[jira] [Created] (KAFKA-13427) Max connections per listener are not blocked

["Ekaterina Chernousova (Jira)" <ji...@apache.org>]

Ekaterina Chernousova created KAFKA-13427:
---------------------------------------------

             Summary: Max connections per listener are not blocked
                 Key: KAFKA-13427
                 URL: https://issues.apache.org/jira/browse/KAFKA-13427
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 2.7.0
            Reporter: Ekaterina Chernousova


According to the documentation, new connections should be blocked if the listener-level limit max connections (listener.name.example.max.connections) is reached except it's an inter-broker listener.

[http://kafka.apache.org/documentation/#brokerconfigs_max.connections] 

However, it seems an external listener is treated the same way as inter-broker listener which is connections are being accepted and then some connections with lower priority are closed.

When I was running some workloads with the listener.name.example.max.connections limit in play, I didn't see any toomanyconnections exceptions, from clients side it was connections were established and disconnected later. 

After checking the source code [https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/network/SocketServer.scala#L715] I don't see the listener-level max connections limit is being checked before accepting a connection.

 

Setting a lower priority as I'm not sure if it's a documentation error or a bug, please let me know if I missed something, thanks!

 



--
This message was sent by Atlassian Jira
(v8.3.4#803005)