[jira] [Created] (KAFKA-13597) Memory leak with kafka-clients 3.0.0

["Willian Dallastella (Jira)" <ji...@apache.org>]

Willian Dallastella created KAFKA-13597:
-------------------------------------------

             Summary: Memory leak with kafka-clients 3.0.0
                 Key: KAFKA-13597
                 URL: https://issues.apache.org/jira/browse/KAFKA-13597
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 3.0.0
            Reporter: Willian Dallastella
         Attachments: image-2022-01-17-12-59-43-411.png, image-2022-01-17-13-01-43-418.png

I'm having this issue reported here: [https://github.com/spring-projects/spring-kafka/issues/2056]
 
It is a Spring Boot 2.5.7 application that started failing when updated to Spring Boot 2.6.1.
This updated *kafka-clients {color:#00875a}2.7.1{color}* to *{color:#FF0000}3.0.0{color}* and started causing the memory leak.
 
The service is using a standard spring *katkaTemplate* to send messages.
{code:java}
kafkaTemplate.send(
    topic,
    id,
    data
).addCallback(kafkaLoggerCallback) {code}
This producer is quite heavy (2-2k messages/s)
 
*Downgrading* just the lib *kafka-clients* to *{color:#00875a}2.7.1{color}* solves the issue.
h2. Memory leak sample
 * The green line around 16:40 is the service using kafka-clients 2.7.1
 * The pink line around 16:55 is without downgrading, that means kafka-clients 3.0.0
!image-2022-01-17-12-59-43-411.png|width=1379,height=411!
 
h2. Profiling sample
 
!image-2022-01-17-13-01-43-418.png!



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