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Date: Wed, 8 Aug 2007 09:03:00 -0700 (PDT)
From: "Ning Li (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-847) Factor merge policy out of
 IndexWriter
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    [ https://issues.apache.org/jira/browse/LUCENE-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12518486 ] 

Ning Li commented on LUCENE-847:
--------------------------------

The following comments are about the impact on merge if we add
"deleteDocument(int doc)" (and deprecate IndexModifier). Since it
concerns the topic in this issue, I also post it here to get your opinions.

I'm thinking about the impact of adding "deleteDocument(int doc)" on
LUCENE-847, especially on concurrent merge. The semantics of
"deleteDocument(int doc)" is that the document to delete is specified
by the document id on the index at the time of the call. When a merge
is finished and the result is being checked into IndexWriter's
SegmentInfos, document ids may change. Therefore, it may be necessary
to flush buffered delete doc ids (thus buffered docs and delete terms
as well) before a merge result is checked in.

The flush is not necessary if there is no buffered delete doc ids. I
don't think it should be the reason not to support "deleteDocument(int
doc)" in IndexWriter. But its impact on concurrent merge is a concern.

> Factor merge policy out of IndexWriter
> --------------------------------------
>
>                 Key: LUCENE-847
>                 URL: https://issues.apache.org/jira/browse/LUCENE-847
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Steven Parkes
>            Assignee: Steven Parkes
>         Attachments: concurrentMerge.patch, LUCENE-847.patch.txt, LUCENE-847.txt
>
>
> If we factor the merge policy out of IndexWriter, we can make it pluggable, making it possible for apps to choose a custom merge policy and for easier experimenting with merge policy variants.

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