[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-135) Create a RAMDirectoryProvider from an existing Lucene FSDirectory
Sanne Grinovero (JIRA)
noreply at atlassian.com
Fri Jul 23 11:54:35 EDT 2010
[ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37896#action_37896 ]
Sanne Grinovero commented on HSEARCH-135:
-----------------------------------------
that's true we could provide an helper explicitly meant for that, but I was wondering how to best implement this issue: it was created 3 years ago so I don't think we have a clear idea about it; working for RAM only seems limitating (and harder to impl to limit it to RAM only) - and otherwise it could also be used for the mentioned migration purposes. So it's more that I don't see shy we should limit it to RAM only, just do it generically and let people make the use they wish of it.
> 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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