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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-1411) Enable IndexWriter to open an arbitrary commit point
Date Mon, 20 Oct 2008 09:50:44 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-1411.
----------------------------------------

    Resolution: Fixed

> Enable IndexWriter to open an arbitrary commit point
> ----------------------------------------------------
>
>                 Key: LUCENE-1411
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1411
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1411.patch
>
>
> With a 2-phase commit involving multiple resources, each resource
> first does its prepareCommit and then if all are successful they each
> commit.  If an exception or timeout/power loss is hit in any of the
> resources during prepareCommit or commit, all of the resources must
> then rollback.
> But, because IndexWriter always opens the most recent commit, getting
> Lucene to rollback after commit() has been called is not easy, unless
> you make Lucene the last resource to commit.  A simple workaround is
> to simply remove the segments_N files of the newer commits but that's
> sort of a hassle.
> To fix this, we just need to add a ctor to IndexWriter that takes an
> IndexCommit.  We recently added this for IndexReader (LUCENE-1311) as
> well.  This ctor is definitely an "expert" method, and only makes
> sense if you have a custom DeletionPolicy that preserves more than
> just the most recent commit.

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