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https://issues.apache.org/jira/browse/CASSANDRA-19457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17824198#comment-17824198
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Jane He commented on CASSANDRA-19457:
-------------------------------------
I reproduced this. My program keeps opening and closing connections, when there
are 901 connections created, there are 901 `DefaultSession` in the heap.
However, my investigation shows that the leak comes from `NodeStateEvent` and
`DistanceEvent`.
You have to turn on the `MicrometerMetricsFactory` to reproduce this.
{code:java}
datastax-java-driver.advanced.metrics {
session.enabled = [ connected-nodes, cql-requests ]
node.enabled = [ pool.open-connections, pool.in-flight ]
factory.class = MicrometerMetricsFactory
}{code}
> Memory Leak of `DefaultSession`
> -------------------------------
>
> Key: CASSANDRA-19457
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19457
> Project: Cassandra
> Issue Type: Bug
> Components: Client/java-driver
> Reporter: Jane He
> Assignee: Jane He
> Priority: Normal
> Attachments: Screenshot 2024-03-06 at 2.07.01 PM.png, Screenshot
> 2024-03-06 at 2.07.13 PM.png
>
>
> There is a memory leak of previous closed {{{}DefaultSession{}}}s. It can be
> reproduced by this:
> {code:java}
> public static void main(String[] args) throws InterruptedException {
> Semaphore sema = new Semaphore(20);
> for (int i = 0; i < 10000; i++) {
> new Thread(() -> {
> try {
> sema.acquire();
> try(CqlSession session = CqlSession.builder()
>
> .withCloudSecureConnectBundle(Paths.get("bundle.zip"))
> .withAuthCredentials("token", "<some token here>")
> .build()) {
> // Do stuff
> }
> } catch (Exception e) {
> System.out.println(e);
> } finally {
> sema.release();
> }
> }).start();
> }
> }{code}
> On initial investigation, it seems like
> {{MicrometerMetricUpdater.initializeGauge()}} uses
> {{{}Gauge.{}}}{{{}_builder()_{}}} _using_ {{_Supplier_}} _._ This creates a
> strong reference that is causing the issue.
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