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https://issues.apache.org/jira/browse/OAK-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-2247:
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Component/s: (was: oak-lucene)
lucene
> 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: lucene
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
>
> 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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