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https://issues.apache.org/jira/browse/OAK-839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665154#comment-13665154
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Michael Dürig commented on OAK-839:
-----------------------------------
Agreed. Personally I don't like {{RangeIterator}} et all. neither. However
these are part of the JCR API and we need to make sure we at least know the
impact on backward compatibility when we decide not to implement their full
functionality (i.e. {{getSize()}).
I suggest to follow up on both fronts here: determine the root cause for
{{getChildNodeCount}} being slow, try to fix that and try to avoid upfront
calculation of the sizes for {{getNodes}}.
> Optimization in the Node#getNodes
> ---------------------------------
>
> Key: OAK-839
> URL: https://issues.apache.org/jira/browse/OAK-839
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: jcr
> Reporter: Antonio Sanso
> Attachments: GetNodesTest.java, OAK-839-patch
>
>
> I have done some simple test with Node#getNodes and it seems that is really
> slow (specially compared with the Jackrabbit case).
> My test is really simple. (see as well attached GetNodesTest).
> I create a node with 10000 children and do
> NodeIterator iterator = reader.getNode("/a").getNodes();
> The performance test shows a huge regression if compared with Jackrabbit
> * Jackrabbit
> Apache Jackrabbit Oak 0.9-SNAPSHOT
> # ReadStatusTestSingleACL min 10% 50% 90% max N
> Jackrabbit 0 0 0 1 10 33592
> * Oak
> Apache Jackrabbit Oak 0.9-SNAPSHOT
> # ReadStatusTestSingleACL min 10% 50% 90% max N
> Oak-Memory 123 125 128 144 168 115
> Me and [~tmueller] were able to find the cause of the sloweness.
> It seems that the o.a.j.oak.jcr.delegate.NodeDelegate and
> o.a.j.oak.jcr.NodeImpl are calling getChildrenCount that seems to be an
> expensive operation (and not really needed in this case).
> Patch to follow
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