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https://issues.apache.org/jira/browse/LUCENE-2311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844250#action_12844250
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Earwin Burrfoot commented on LUCENE-2311:
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Not only newly created, but newly opened too! So your readers are warmed, if
you just created an IW, called getReader, and didn't do any writes at all yet.
> Pass potent SR to IRWarmer.warm(), and also call warm() for new segments
> ------------------------------------------------------------------------
>
> Key: LUCENE-2311
> URL: https://issues.apache.org/jira/browse/LUCENE-2311
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Earwin Burrfoot
> Fix For: 3.1
>
>
> Currently warm() receives a SegmentReader without terms index and docstores.
> It would be arguably more useful for the app to receive a fully loaded
> reader, so it can actually fire up some caches. If the warmer is undefined on
> IW, we probably leave things as they are.
> It is also arguably more concise and clear to call warm() on all newly
> created segments, so there is a single point of warming readers in NRT
> context, and every subreader coming from getReader is guaranteed to be warmed
> up -> you don't have to introduce even more mess in your code by rechecking
> it.
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