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https://issues.apache.org/jira/browse/OAK-4697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated OAK-4697:
----------------------------------
Labels: observation performance (was: )
> Optimize read of old node state
> -------------------------------
>
> Key: OAK-4697
> URL: https://issues.apache.org/jira/browse/OAK-4697
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core, documentmk
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Labels: observation, performance
> Fix For: 1.6
>
>
> Reading a node state with an old revision from a document can be expensive
> when many changes happened on a property in the meantime.
> A typical stack trace looks like this:
> {noformat}
> at
> org.apache.jackrabbit.oak.plugins.document.NodeDocument.getPreviousDocument(NodeDocument.java:1337)
> at
> org.apache.jackrabbit.oak.plugins.document.PropertyHistory$1.apply(PropertyHistory.java:70)
> at
> org.apache.jackrabbit.oak.plugins.document.PropertyHistory$1.apply(PropertyHistory.java:63)
> at com.google.common.collect.Iterators$8.transform(Iterators.java:794)
> at
> com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
> at com.google.common.collect.Iterators$7.computeNext(Iterators.java:646)
> at
> com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
> at
> com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
> at
> com.google.common.collect.Iterators$PeekingImpl.hasNext(Iterators.java:1139)
> at
> org.apache.jackrabbit.oak.plugins.document.PropertyHistory$2.refillQueue(PropertyHistory.java:121)
> at
> org.apache.jackrabbit.oak.plugins.document.PropertyHistory$2.computeNext(PropertyHistory.java:96)
> at
> org.apache.jackrabbit.oak.plugins.document.PropertyHistory$2.computeNext(PropertyHistory.java:88)
> at
> com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
> at
> com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
> at
> org.apache.jackrabbit.oak.plugins.document.ValueMap$1$3.nextIterator(ValueMap.java:105)
> at
> org.apache.jackrabbit.oak.plugins.document.util.MergeSortedIterators.fetchNextIterator(MergeSortedIterators.java:98)
> at
> org.apache.jackrabbit.oak.plugins.document.util.MergeSortedIterators.next(MergeSortedIterators.java:85)
> at
> com.google.common.collect.Iterators$PeekingImpl.peek(Iterators.java:1162)
> at
> org.apache.jackrabbit.oak.plugins.document.util.MergeSortedIterators.adjustFirst(MergeSortedIterators.java:117)
> at
> org.apache.jackrabbit.oak.plugins.document.util.MergeSortedIterators.next(MergeSortedIterators.java:78)
> at
> org.apache.jackrabbit.oak.plugins.document.NodeDocument.getLatestValue(NodeDocument.java:1972)
> at
> org.apache.jackrabbit.oak.plugins.document.NodeDocument.getNodeAtRevision(NodeDocument.java:990)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readNode(DocumentNodeStore.java:1079)
> {noformat}
> The read operation goes through the property history until it finds the most
> recent change. The old the read revision, the more changes are scanned.
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