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https://issues.apache.org/jira/browse/LUCENE-1918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757080#action_12757080
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Michael McCandless commented on LUCENE-1918:
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Mark, I think we should commit this for 2.9?
> Adding empty ParallelReader indexes to an IndexWriter may cause
> ArrayIndexOutOfBoundsException or NoSuchElementException
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1918
> URL: https://issues.apache.org/jira/browse/LUCENE-1918
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.4.1, 2.4.2, 2.9
> Environment: any
> Reporter: Christian Kohlschütter
> Assignee: Michael McCandless
> Fix For: 2.4.1, 2.9
>
> Attachments: LUCENE-1918.patch,
> ParallelReaderWithEmptyIndex-testcase.patch,
> ParallelReaderWithEmptyIndex.patch
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Hi,
> I recently stumbled upon this:
> It is possible (and perfectly legal) to add empty indexes (IndexReaders) to
> an IndexWriter. However, when using ParallelReaders in this context, in two
> situations RuntimeExceptions may occur for no good reason.
> Condition 1:
> The indexes within the ParallelReader are just empty.
> When adding them to the IndexWriter, we get a
> java.util.NoSuchElementException triggered by ParallelTermEnum's constructor.
> The reason for that is the TreeMap#firstKey() method which was assumed to
> return null if there is no entry (which is not true, apparently -- it only
> returns null if the first key in the Map is null).
> Condition 2 (Assuming the aforementioned bug is fixed):
> The indexes within the ParallelReader originally contained one or more fields
> with TermVectors, but all documents have been marked as deleted.
> When adding the indexes to the IndexWriter, we get a
> java.lang.ArrayIndexOutOfBoundsException triggered by
> TermVectorsWriter#addAllDocVectors. The reason here is that TermVectorsWriter
> assumes that if the index is marked to have TermVectors, at least one field
> actually exists for that. This unfortunately is not true, either.
> Patches and a testcase demonstrating the two bugs are provided.
> Cheers,
> Christian
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