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From "Michael McCandless (JIRA)" <>
Subject [jira] Resolved: (LUCENE-2513) IndexReader overwrites future commits when you open it on a past commit
Date Sat, 03 Jul 2010 09:30:49 GMT


Michael McCandless resolved LUCENE-2513.

    Resolution: Fixed

> IndexReader overwrites future commits when you open it on a past commit
> -----------------------------------------------------------------------
>                 Key: LUCENE-2513
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.1, 4.0
>         Attachments: LUCENE-2513.patch
> Hit this on trying to build up a test index for perf testing...
> IndexReader (and Writer) accept an IndexCommit on open.
> This is quite powerful, because, if you use a deletion policy that keeps multiple commits
around, you can open a not-current commit, make some changes, write a new commit, all without
altering the "future" commits.
> I use this to first build up a big wikipedia index, including one commit w/ multiple
segments, then another commit after optimize(), and then I open an writable IR to perform
deletions off of both those commits.  This gives me a single test index that has all four
combinations (single vs multi segment; deletions vs no deletions).
> But IndexReader has a bug whereby it overwrites the segments_N file.  (IndexWriter works

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