[jira] [Updated] (LUCENE-4746) Create a move method in Directory.

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-4746:
--------------------------------

    Attachment: LUCENE-4746.patch

here's a prototype.

My main concerns are:
* 3.0 formatted indexes with shared doc stores. We shouldnt support this. throwing exception when we see it makes the method more dangerous / doing an extra-pass to detect it = unacceptable (this is the kind of hairiness we must avoid).
* I dont want a slow (but safe) addIndexes and a fast (but unsafe) moveIndexes. So if we do this, i want java7 as a minimum requirement so we can at least try to create a hard link in Directory.copy() to make addIndexes fast too. 

To me, these both suggest trunk-only, but i'm open to other ideas. 
                
> Create a move method in Directory.
> ----------------------------------
>
>                 Key: LUCENE-4746
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4746
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.2, 5.0
>
>         Attachments: LUCENE-4746.patch
>
>
> I'd like to make a move method for directory.
> We already have a move for Solr in DirectoryFactory, but it seems it belongs at the directory level really.
> The default impl can do a copy and delete, but most implementations will be able to optimize to a rename.
> Besides the move we do for Solr (to move a replicated index into place), it would also be useful for another feature I'd like to add - the ability to merge an index with moves rather than copies. In some cases, you don't need/want to copy all the files and could just rename/move them. 

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