[jira] [Commented] (IGNITE-18604) Memory Leak in Micronaut

["Vadim Pakhnushev (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-18604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691147#comment-17691147 ] 

Vadim Pakhnushev commented on IGNITE-18604:
-------------------------------------------

Classes annotated with {{@Controller}} are leaking from the {{io.micronaut.web.router.AnnotatedMethodRouteBuilder}} which are held by the singleton {{io.micronaut.web.router.DefaultRouter}} which in the end is held by the {{io.micronaut.http.server.netty.NettyHttpServer}}. I couldn't find a way to reliably clean all of these references.

> Memory Leak in Micronaut
> ------------------------
>
>                 Key: IGNITE-18604
>                 URL: https://issues.apache.org/jira/browse/IGNITE-18604
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Ivan Bessonov
>            Priority: Major
>              Labels: ignite-3
>
> Micronaut class code contains the following code:
> {code:java}
> Runtime.getRuntime().addShutdownHook(new Thread(() -> {
>     if (LOG.isInfoEnabled()) {
>         LOG.info("Embedded Application shutting down");
>     }
>     if (embeddedApplication.isRunning()) {
>         embeddedApplication.stop();
>         countDownLatch.countDown();
>         if (finalKeepAlive) {
>             mainThread.interrupt();
>         }
>     }
> })); {code}
> This hook is never removed, thus there's a GC root for the "embeddedApplication" instance. It leaks beans and other stuff, for example:
>  * io.micronaut.runtime.Micronaut#exitHandlers
>  * io.micronaut.context.DefaultApplicationContextBuilder#singletons
>  * ...
> This is bad, because inside of all of this we have classes like ClusterManagementRestFactory and 
> ClusterManagementController that refer to Ignite components and have particularly big footprints.
>  
> As a result, if you run org.apache.ignite.internal.rest.ItGeneratedRestClientTest in a loop, it eats all the memory.



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