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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1076) Allow MergePolicy to select non-contiguous merges
Date Tue, 21 Jul 2009 18:22:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733770#action_12733770
] 

Shai Erera commented on LUCENE-1076:
------------------------------------

So Mike - just to clarify. If I have 3 segments: A (0-52), B (53-124) and C (125-145), and
you decide to merge A and C, what will be the new doc IDs of all segments? will they start
from 53? or will you shift all the documents so that the segments will be B (0-71) and A+C
(72-145)?

> 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
>         Attachments: 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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