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https://issues.apache.org/jira/browse/LUCENE-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-5684:
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Attachment: LUCENE-5684.patch
Patch, I think it's ready. I also tried to clean up
StandardDirectoryReader.open a bit: it was scary how it would assign to
newReaders[i] a non-incRef'd reader. I was sure it was a bug, and made a test
case to show it, but the test case wouldn't fail and on staring at the code
some more I noticed the i++ in the finally clause that prevents the bug ...
> Add best effort detection when index is removed & recreated before
> openIfChanged
> --------------------------------------------------------------------------------
>
> Key: LUCENE-5684
> URL: https://issues.apache.org/jira/browse/LUCENE-5684
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.9, 5.0
>
> Attachments: LUCENE-5684.patch
>
>
> I dug into the confusing NPE from the java-user email with subject "[lucene
> 4.6] NPE when calling IndexReader#openIfChanged".
> It happens because the app was opening an IndexReader, then rm -rf the entire
> index, build a new one, then calling reopen. This is invalid usage (the app
> should instead use IW.deleteAll, or open new IW with OpenMode.CREATE), but
> I'd like to add a minor best effort check...
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