Chetan Mehrotra created OAK-1724:
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Summary: Enable copying of Lucene index to local file system for
read queries
Key: OAK-1724
URL: https://issues.apache.org/jira/browse/OAK-1724
Project: Jackrabbit Oak
Issue Type: Improvement
Components: query
Reporter: Chetan Mehrotra
Assignee: Chetan Mehrotra
Fix For: 1.0, 1.1
Currently the Lucene index is stored in NodeStore and is accessed via
OakDirectory which is an implementation of [Lucene
Directory|https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/store/Directory.html].
This would work fine for SegmentStore but does not work very well when
BlobStore is used as with DocumentNodeStore
For such scenarios it should be possible to copy the Lucene index to local file
system and then read queries are performed using that. IndexWriter would
continue to use the OakDirectory to store the updated index content in
NodeStore.
As Lucene does not modify any index file once created (ther are either deleted
or new one created), it should be possible to incrementally update the index by
copying newly created segment files.
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