Consistency checker performance improvements
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Key: JCR-3263
URL: https://issues.apache.org/jira/browse/JCR-3263
Project: Jackrabbit Content Repository
Issue Type: Improvement
Reporter: Unico Hommes
Currently the consistency checker loads in a batch of node ids and for each
node id fetches the corresponding bundle, its child bundles, and parent bundle
separately. This makes the consistency checker perform less than optimal and
may take hours (days?) to complete for large repositories.
I've been able to make the checker execute about 20 times faster on my local
machine by loading in batches of node prop bundles at once. For 17000 nodes in
the workspace the current implementation ran for about 23 seconds whereas with
the enhancements I made it finished in 1.2 seconds.
Now the problem lies in the fact that loading in node prop bundles in batches
may require a lot of memory. And it is not very predictable how much per batch
size because the sizes of the individual bundles are unpredictable.
Also the node prop bundle contains much more information than is needed for a
consistency check.
What would be ideal in this situation is to introduce a new type - call it
NodeInfo - that contains only the structural information the checker needs to
do its work. Meaning the node id, the parent id and the child ids. In order to
allow for a possible future referential integrity check perhaps also its
reference type propeties.
The IterablePersistenceManager interface would then get an additional method:
Map<NodeId, NodeInfo> getAllNodeInfos();
If this is an acceptable proposal I would like to work on this and contribute a
patch.
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