[ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37891#action_37891 ]

Sanne Grinovero commented on HSEARCH-135:
-----------------------------------------

I'd propose to convert this issue to a more general purpose "copy directory A to B at startup" and "copy dir X to Y at shutdown" (both optional).
So people could use that to pre-populate the RAMDirectory from a FSDirectory, but also to/from an InfinispanDirectory.

This could be handy to upgrade to InfinispanDirectory from a FSDirectory, or to keep copies of the Infinispan one on FSdirectory at shutdown, so people can optionally revert from the migration.

> Create a RAMDirectoryProvider from an existing Lucene FSDirectory
> -----------------------------------------------------------------
>
>           Key: HSEARCH-135
>           URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-135
>         Project: Hibernate Search
>       Issue Type: New Feature
>       Components: directory provider
>        Reporter: Hardy Ferentschik
>        Priority: Minor
>         Fix For: 3.3.0
>
>
> It would be nice to have the ability to use a Lucene RAM index which gets constucted from an existing Lucene file based indexed. For example in an JMS setup the master could create a file based Lucene index, share it out to the slaves which in turn use this file based index to populate a RAM index. This would give you the best of two worlds.
> Not sure how hard it would be to implement this in an unclustered environment.
> [*] read from FS at startup (optionally, should be configurabile)
> [*] write back to FS at shutdown (optionally, should be configurabile)
> [*] document the behaviour, especially warning about this case: some setups are doing local clustering: 2 instances sharing the directory. This obviously can't work, so they should avoid using this feature of writing back to FS.

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