[jboss-jira] [JBoss JIRA] (WFLY-12486) Memory leak in OpenTracing when deployment is redeployed multiple times

[Jan Stourac (Jira)]

Jan Stourac created WFLY-12486:
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             Summary: Memory leak in OpenTracing when deployment is redeployed multiple times
                 Key: WFLY-12486
                 URL: https://issues.jboss.org/browse/WFLY-12486
             Project: WildFly
          Issue Type: Bug
          Components: MP OpenTracing
    Affects Versions: 17.0.1.Final, 17.0.0.Final
            Reporter: Jan Stourac
            Assignee: Jeff Mesnil
         Attachments: memory-leak-bad.png, memory-leak-good.png

There seems to be a memory leak when a deployment is redeployed multiple times (100 times in our test). This is very similar to what has been described in WFLY-10991. Also first commit this started to happen is [this one|https://github.com/wildfly/wildfly/commit/74170b5f49dd83f6b9ebd489f85e130df5521549] - JaegerTracing and Apache Thrift dependencies update. Thus I selected MP OpenTracing component for this issue.

Test and deployment is same as is described in WFLY-10991.

Size of the extra heap in use is about 27MB plus when compared to the initial size before multiple redeploy operations.

I've tried to check manually via [visualVM|https://visualvm.github.io/] tool. Screenshot with suspicious jaegertracing instances are attached - there are much more jaegertracing class instances with new version of Jager Tracing and Apache Thrift dependencies, which is suspicious.

Interesting thing is that when microprofile-opentracing-smallrye subsystem is removed via:
{code}
/subsystem=microprofile-opentracing-smallrye:remove()
{code}
the memory leak is still present. This is kind of confusing to me.



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