Reduce memory usage of DocIds
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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
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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