Speed up hierarchy cache initialization
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Key: JCR-3107
URL: https://issues.apache.org/jira/browse/JCR-3107
Project: Jackrabbit Content Repository
Issue Type: Improvement
Components: jackrabbit-core
Reporter: Martin Böttcher
Initializing a workspace can take quite a long time if there is a big number of
nodes and some search indexes involved. The reason is that the setup of the
CachingIndexReader is processed using chunks of a certain size (actually 400K)
in order to reduce the memory footprint. As soon as the number of documents
exceeds this limit some operations (actually traversing complete indexes) are
performed again and again.
It seems that the current algorithm "initializeParents" in the
CachingIndexReader class can't be optimized without increasing the memory
consumption. Therefore it should be a promising approach to persist the "state"
of this class (actually it's main member array and map) and reload it on
startup.
The "load" of the state can be done implicitly in the initializing phase of the
cache. This is obvious. The correct point of time to call the "save" operation
isn't obvious at all. I tried the "doClose" method of the class and it seems
sufficient.
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