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https://issues.apache.org/jira/browse/LUCENE-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763440#action_12763440
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Andrzej Bialecki commented on LUCENE-1959:
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I'm of a split mind about this splitter ;) in the sense that I'm not sure how
useful it is - if your input is an optimized index then it has just 1 segment,
so this tool won't be able to split it, right?
AFAIK a similar functionality can be implemented also using two other methods
that would work on indexes with any number of segments: one method is trivial,
based on a "delete/IndexWriter.addIndexes/undeletAll" loop that requires
multiple passes over input data, the other would use the same method as
SegmentMerger uses, i.e. working with FieldsWriter, FormatPostings*Consumer,
TermVectorsWriter, etc. for a single-pass splitting.
So I guess I'm -0 on this index splitting method, because I think we can do it
better.
> Index Splitter
> --------------
>
> Key: LUCENE-1959
> URL: https://issues.apache.org/jira/browse/LUCENE-1959
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.9
> Reporter: Jason Rutherglen
> Assignee: Michael McCandless
> Priority: Trivial
> Fix For: 3.1
>
> Attachments: LUCENE-1959.patch
>
>
> If an index has multiple segments, this tool allows splitting those segments
> into separate directories.
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