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https://issues.apache.org/jira/browse/LUCENE-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696184#action_12696184
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Jason Rutherglen commented on LUCENE-1584:
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I think it's good to take a step back, "if we fix Lucene's field
cache, and Lucene's near real-time search manages CSF's
efficiently in memory" fixes the use case. Relying on CSF coming
in probably won't help this the case if it doesn't make it into
the 2.9 release. I like the callback method because it does not
rely on passing segment infos around and instead uses the
already public IndexReader classes.
> 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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