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https://issues.apache.org/jira/browse/SLING-13133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joerg Hoh reassigned SLING-13133:
---------------------------------
Assignee: Joerg Hoh
> MergingServletResourceProvider.listChildren() reads eagerly all children
> ------------------------------------------------------------------------
>
> Key: SLING-13133
> URL: https://issues.apache.org/jira/browse/SLING-13133
> Project: Sling
> Issue Type: Improvement
> Components: Servlets
> Affects Versions: Servlets Resolver 3.0.6
> Reporter: Joerg Hoh
> Assignee: Joerg Hoh
> Priority: Major
>
> In our AEM setup every call to ResourceResolver.listChildren() is passing
> invoking the MergingServletResourceProvider.listChldren():
> {noformat}
> at
> org.apache.sling.jcr.resource.internal.helper.jcr.JcrNodeResourceIterator.next(JcrNodeResourceIterator.java:43)
> at
> org.apache.sling.servlets.resolver.internal.resource.MergingServletResourceProvider.listChildren(MergingServletResourceProvider.java:175)
> at
> org.apache.sling.resourceresolver.impl.providers.stateful.AuthenticatedResourceProvider.listChildren(AuthenticatedResourceProvider.java:169)
> at
> org.apache.sling.resourceresolver.impl.helper.ResourceResolverControl.listChildren(ResourceResolverControl.java:307)
> at
> org.apache.sling.resourceresolver.impl.ResourceResolverImpl.listChildren(ResourceResolverImpl.java:572)
> at
> org.apache.sling.api.resource.AbstractResource.listChildren(AbstractResource.java:91)
> at
> org.apache.sling.api.resource.ResourceWrapper.listChildren(ResourceWrapper.java:105)
> {noformat}
> MergingServletResourceProvider.listChldren() itself is iterating through all
> children of the parentProvider and ads them to a LinkedHashMap, eventually
> returning an iterator to the values of this map.
> If the parentProvider has many children, and only a few of the children are
> read, this causes a massive overhead in terms of time and memory. This
> approach should be changed to a streaming approach, which is only consume
> children from the parentProvider if required.
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