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https://issues.apache.org/jira/browse/KAFKA-16687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849461#comment-17849461
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FTR commented on KAFKA-16687:
-----------------------------
Handle personal issue, sorry late to reply. Just found more, I saw 1 line code
in my before project didn't close after creating KafkaConsumer instance. I
think it's caused by this.
> Native memory leak by Unsafe_allocatememory in Kafka Clients 3.7.0
> --------------------------------------------------------------------
>
> Key: KAFKA-16687
> URL: https://issues.apache.org/jira/browse/KAFKA-16687
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer
> Affects Versions: 3.7.0
> Reporter: FTR
> Assignee: Philip Nee
> Priority: Major
> Attachments: diff
>
>
> I am building a Java Project which using Maven dependency Kafka-clients with
> 3.7.0 version.
> My Java application logic is to use Kafka Consumer to poll Kakfa broker topic
> continuously.
> I have configured my Java application with JVM options with -Xms8G -Xmx8G
> -XX:MaxMetaspaceSize=4G, and then run it.
> Also, there are 16G physical memory on my virtual machine.
> After my Java application running a long time, I have found that resident
> memory of the Java Process was being grown to more than 14G.
> In the end, the Java process ate Swap space.
> I checked it with jmap -heap pid, and found heap memory usage is Ok.
> Also with Native Memory Tracking [jcmd pid Native.memory detail.diff], I
> found that it's caused by [NMT Internal] memory, which created by
> Unsafe_allocatememory xxx.
> In my Java application, I don't use any NIO DirectByteBuffer to allocate
> memory.
> And I check it the Kafka-clients source code, it have codes with use
> "sun.misc.unsafe" to allocate memory. And MaxMetaspaceSize not work for it .
>
> Could you help to check it? How could I to stop this growing native memory to
> avoid my System hang?
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