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https://issues.apache.org/jira/browse/LUCENE-818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478544
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Hoss Man commented on LUCENE-818:
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i would make sure to *heavily* document each and every use of isOpen/ensureOpen
to make it clear why they are being used when they are from a performance
concern case ... otherwise people will be very confused down the road ("why the
hell isn't this being checked until the catch block?!?!?!")
> IndexWriter should detect when it's used after being closed
> -----------------------------------------------------------
>
> Key: LUCENE-818
> URL: https://issues.apache.org/jira/browse/LUCENE-818
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.1
> Reporter: Michael McCandless
> Assigned To: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-818.patch, LUCENE-818.take2.patch,
> LUCENE-818.take3.patch
>
>
> Spinoff from this thread on java-user:
> http://www.gossamer-threads.com/lists/lucene/java-user/45986
> If you call addDocument on IndexWriter after it's closed you'll hit a
> hard-to-explain NullPointerException (because the RAMDirectory was
> closed). Before 2.1, apparently you won't hit any exception and the
> IndexWrite will keep running but will have released it's write lock (I
> think).
> I plan to fix IndexWriter methods to throw an IllegalStateException if
> it has been closed.
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