Chetan Mehrotra created OAK-2247:
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Summary: CopyOnWriteDirectory implementation for Lucene for use in
indexing
Key: OAK-2247
URL: https://issues.apache.org/jira/browse/OAK-2247
Project: Jackrabbit Oak
Issue Type: Improvement
Components: oak-lucene
Reporter: Chetan Mehrotra
Assignee: Chetan Mehrotra
Fix For: 1.2
Currently a Lucene index when is written directly to OakDirectory. For reindex
case it might happen that Lucene merge policy read the written index files
again and then perform a sgement merge. This might have lower performance when
OakDirectroy is writing to remote storage.
Instead of that we can implement a CopyOnWriteDirectory on similar lines to
OAK-1724 where CopyOnReadDirectory support copies the index locally for faster
access.
At high level flow would be
# While writing index the index file is first written to local directory
# Any write is done locally and once a file is written its written
asynchronously to OakDirectory
# When IndexWriter is closed it would wait untill all the write is completed
This needs to be benchmarked with existing reindex timings to see it its
actually beneficial
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