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https://issues.apache.org/jira/browse/LUCENE-874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494026
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João Fonseca commented on LUCENE-874:
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> I would consider a JMS solution on top of NotifiableIndex (or your own
> factory).
JMS seems to be a complicated and heavy solution to a simple and recurring
problem for those using Lucene: you want to use a singleton IndexSearcher to
improve performance, but when the index changes, you want the IndexSearch to
show the updated information.
> Automatic reopen of IndexSearcher/IndexReader
> ---------------------------------------------
>
> Key: LUCENE-874
> URL: https://issues.apache.org/jira/browse/LUCENE-874
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: João Fonseca
> Priority: Minor
>
> To improve performance, a single instance of IndexSearcher should be used.
> However, if the index is updated, it's hard to close/reopen it, because
> multiple threads may be accessing it at the same time.
> Lucene should include an out-of-the-box solution to this problem. Either a
> new class should be implemented to manage this behaviour (singleton
> IndexSearcher, plus detection of a modified index, plus safely closing and
> reopening the IndexSearcher) or this could be behind the scenes by the
> IndexSearcher class.
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