[jira] [Assigned] (SLING-13133) MergingServletResourceProvider.listChildren() reads eagerly all children

["Joerg Hoh (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLING-13133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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