[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-135) Create a RAMDirectoryProvider from an existing Lucene FSDirectory

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37907#action_37907 ] 

Emmanuel Bernard commented on HSEARCH-135:
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It's Hardy's baby. I would not mind closing this issue. 

> 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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