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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1076) Allow MergePolicy to select non-contiguous merges
Date Wed, 22 Jul 2009 17:03:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734190#action_12734190
] 

Michael McCandless commented on LUCENE-1076:
--------------------------------------------

bq. Will wait for you to come back to it

Feel free to take it, too :)

I think LUCENE-1737 is also very important for speeding up merging, especially because it's
so "unexpected" that just by adding different fields to your docs, or the same fields in different
orders, can so severely impact merge performance.

> 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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