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Date: Thu, 3 Feb 2011 15:26:29 +0000 (UTC)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] Updated: (LUCENE-1076) Allow MergePolicy to select
 non-contiguous merges
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     [ https://issues.apache.org/jira/browse/LUCENE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-1076:
---------------------------------------

    Fix Version/s:     (was: 3.2)
                   3.1

I think we can do this for 3.1, but I'll leave the default as always doing contiguous merges.

> Allow MergePolicy to select non-contiguous merges
> -------------------------------------------------
>
>                 Key: LUCENE-1076
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1076
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.3
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-1076.patch, LUCENE-1076.patch
>
>
> I started work on this but with LUCENE-1044 I won't make much progress
> on it for a while, so I want to checkpoint my current state/patch.
> For backwards compatibility we must leave the default MergePolicy as
> selecting contiguous merges.  This is necessary because some
> applications rely on "temporal monotonicity" of doc IDs, which means
> even though merges can re-number documents, the renumbering will
> always reflect the order in which the documents were added to the
> index.
> Still, for those apps that do not rely on this, we should offer a
> MergePolicy that is free to select the best merges regardless of
> whether they are continuguous.  This requires fixing IndexWriter to
> accept such a merge, and, fixing LogMergePolicy to optionally allow
> it the freedom to do so.

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