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https://issues.apache.org/jira/browse/LUCENE-5177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741613#comment-13741613
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Robert Muir commented on LUCENE-5177:
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Thats all solr issues, its not related here.
DocValues fields take a byte[]. you can put whatever you want in there, it
doesnt have to be the same as what goes in a stored field, you can run it thru
an analysis chain yourself in some solr document processor or something like
that if you really want to do that... you don't need indexwriter's help.
> remove fieldcache weakmap or at least see what relies on GC for purging today
> -----------------------------------------------------------------------------
>
> Key: LUCENE-5177
> URL: https://issues.apache.org/jira/browse/LUCENE-5177
> Project: Lucene - Core
> Issue Type: Test
> Reporter: Robert Muir
> Attachments: LUCENE-5177.patch
>
>
> If we are registering close listeners why does this need to be weak?
> But really i dont care about that, here is what i said to Hoss on the solr
> mailing list:
> {quote}
> > (In any case: it looks like a WeakHashMap is still used in case the
> > listeners never get called, correct?)
> >
> I think it might be the other way around: i think it was weakmap
> before always, the close listeners were then added sometime in 3.x
> series, so we registered purge events "as an optimization".
> But one way to look at it is: readers should really get closed, so why
> have the weak map and not just a regular hashmap.
> Even if we want to keep the weak map (seriously i dont care, and i
> dont want to be the guy fielding complaints on this), I'm going to
> open with an issue with a patch that removes it and fails tests in
> @afterclass if there is any entries. This way its totally clear
> if/when/where anything is "relying on GC" today here and we can at
> least look at that.
> {quote}
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