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https://issues.apache.org/jira/browse/LUCENE-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-4492:
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Fix Version/s: (was: 4.7)
4.8
> Immutable Suggester impls. should be immutable
> ----------------------------------------------
>
> Key: LUCENE-4492
> URL: https://issues.apache.org/jira/browse/LUCENE-4492
> Project: Lucene - Core
> Issue Type: Wish
> Components: modules/other
> Affects Versions: 3.6.1, 4.0, 4.1
> Reporter: Simon Willnauer
> Fix For: 4.8
>
>
> Currently we have a very clumsy interface to build and load the Suggesters
> that are immutable. All our FST impls must be somewhat pre-build and then
> loaded. But currently the code doesn't declare the fst member as final and
> lets you change it at any time. ie you can always call load / build. This
> makes safe publication tricky and required custom code to make this
> reasonable. Ie. you have as suggester that can reload it's dict every 20 min.
> Now if you want to swap this in once loaded you can create a new Lookup
> instance and assign it to a member in your app. Yet this member needs to be
> volatile otherwise threads won't fetch all the memory and you can run into
> NPE exceptions since the fst member is not final. I'd not want to pay the
> price for this volatile read in a suggest env since its really read-only.
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