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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1584) Callback for intercepting merging segments in IndexWriter
Date Tue, 07 Apr 2009 14:39:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696550#action_12696550
] 

Michael McCandless commented on LUCENE-1584:
--------------------------------------------

bq. This is required in one form or another for any kinds of segment-aware caches.

The problem is you need more information than simply "these segments got merged" to actually
do something interesting with your caches.

EG you'd need to know which deleted docs got zapped, right?

bq. We're currently using our own field cache (I doubt we'll ever switch back to lucene's
native, fixed one or not)

Can you explain what's missing in Lucene's FieldCache?  (Since we are going to build a new
one for LUCENE-831 it'd be great to address all known limitations...).

> Callback for intercepting merging segments in IndexWriter
> ---------------------------------------------------------
>
>                 Key: LUCENE-1584
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1584
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1584.patch
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> For things like merging field caches or bitsets, it's useful to
> know which segments were merged to create a new segment.

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