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https://issues.apache.org/jira/browse/OAK-8097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781478#comment-16781478
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Vikas Saurabh commented on OAK-8097:
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[~tmueller], while opening a CoR would indeed copy file to local (assuming
prefetch is true... but, that's default and I guess no one is known to change
it). But, I was wondering if could attempt a copy in {{CopyOnWriteDirectory}}
itself. Maybe as a simple case, change
{{CopyOnWriteDirectory.COWRemoteFileReference#openInput}} to copy from remote
to local (one attempt??) before resorting to open from remote?
> Load Lucene index files before writing to the index
> ---------------------------------------------------
>
> Key: OAK-8097
> URL: https://issues.apache.org/jira/browse/OAK-8097
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Reporter: Thomas Mueller
> Priority: Major
> Fix For: 1.12
>
>
> Right now, Lucene index files are downloaded from the datastore when reading
> from the index (when running a query). However, when updating the index, they
> are not downloaded. So if lazy loading of index files is enabled (OAK-7947),
> files are read from the datastore (streaming). Leading to the following
> warnings in the log file:
> {noformat}
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnWriteDirectory
> COWRemoteFileReference::local file (_2.cfs) doesn't exist
> ...
> {noformat}
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