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https://issues.apache.org/jira/browse/FELIX-5990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701909#comment-16701909
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Pierre De Rop commented on FELIX-5990:
--------------------------------------
Attached dm.memoryleak.tgz, which is a simple project that is reproducing the
issue.
> DM ServiceTracker memory leak
> -----------------------------
>
> Key: FELIX-5990
> URL: https://issues.apache.org/jira/browse/FELIX-5990
> Project: Felix
> Issue Type: Bug
> Components: Dependency Manager
> Affects Versions: dependencymanager-3.0.0
> Reporter: Pierre De Rop
> Assignee: Pierre De Rop
> Priority: Major
> Attachments: dm.memoryleak.tgz, oom.png
>
>
> We have an old memory leak that comes from dependency manager 3.0.0 version,
> where the dm ServiceTracker does not remove the Set used to register highest
> tracked services when an optional ServiceDependency becomes unavailable.
> Here is the old code where the memory leak happens, in
> org.apache.felix.dm.tracker.ServiceTracker.java:
>
> {code:java}
> private void addHighestTrackedCache(ServiceReference reference) {
> Long serviceId = ServiceUtil.getServiceIdObject(reference);
> TreeSet services = (TreeSet) m_highestTrackedCache.get(serviceId);
> if (services == null) {
> services = new TreeSet();
> m_highestTrackedCache.put(serviceId, services);
> }
> services.add(reference);
> }
> private void removeHighestTrackedCache(ServiceReference reference) {
> Long serviceId = ServiceUtil.getServiceIdObject(reference);
> TreeSet services = (TreeSet) m_highestTrackedCache.get(serviceId);
> if (services != null) {
> services.remove(reference);
> }
> }
> {code}
> So, the removeHighestTrackedCache does not remove the TreeSet from the
> m_highestTrackedCache when it becomes empty.
> So, the memory leak happens in the following situation: you have a Consumer
> component which has an optional dependency on a Provider, and the Provider
> service disappears and reappears a huge number of time.
> The memory can grow slowly, but may lead to an OOM in case the framework is
> run for a very long time and if the Provider service is
> registered/unregistered a lot of time.
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