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https://issues.apache.org/jira/browse/JCR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841737#action_12841737
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Marcel Reutegger commented on JCR-2524:
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hmm, you are right. should have looked more closely what the memory analyzer
reported.
here's another idea:
- use int arrays and create PlainDocIds on the fly (possibly using cached
instances)
- a special value in the int array marks the existence of a UUIDDocId, which
are held in a separate map
> Reduce memory usage of DocIds
> -----------------------------
>
> Key: JCR-2524
> URL: https://issues.apache.org/jira/browse/JCR-2524
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-core
> Reporter: Marcel Reutegger
> Priority: Minor
> Attachments: JCR-2524.patch
>
>
> Implementations of DocIds are used to cache parent child relations of nodes
> in the index. Usually there are a lot of duplicate objects because a DocId
> instance is used to identify the parent of a node in the index. That is,
> sibling nodes will all have DocIds with the same value. Currently a new DocId
> instance is created for each node. Caching the most recently used DocIds and
> reuse them might help to reduce the memory usage. Furthermore there are
> DocIds that could be represented with a short instead of an int when possible.
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