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https://issues.apache.org/jira/browse/LUCENE-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061063#comment-13061063
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Simon Willnauer commented on LUCENE-3279:
-----------------------------------------
I plan to commit this soon if nobody objects.
> Allow CFS be empty
> ------------------
>
> Key: LUCENE-3279
> URL: https://issues.apache.org/jira/browse/LUCENE-3279
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Affects Versions: 3.4, 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3279.patch
>
>
> since we changed CFS semantics slightly closing a CFS directory on an error
> can lead to an exception. Yet, an empty CFS is still a valid CFS so for
> consistency we should allow CFS to be empty.
> here is an example:
> {noformat}
> 1 tests failed.
> REGRESSION:
> org.apache.lucene.index.TestIndexWriterOnDiskFull.testAddDocumentOnDiskFull
> Error Message:
> CFS has no entries
> Stack Trace:
> java.lang.IllegalStateException: CFS has no entries
> at
> org.apache.lucene.store.CompoundFileWriter.close(CompoundFileWriter.java:139)
> at
> org.apache.lucene.store.CompoundFileDirectory.close(CompoundFileDirectory.java:181)
> at
> org.apache.lucene.store.DefaultCompoundFileDirectory.close(DefaultCompoundFileDirectory.java:58)
> at
> org.apache.lucene.index.SegmentMerger.createCompoundFile(SegmentMerger.java:139)
> at
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4252)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3863)
> at
> org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:37)
> at
> org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2715)
> at
> org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2710)
> at
> org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2706)
> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3513)
> at
> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2064)
> at
> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2031)
> at
> org.apache.lucene.index.TestIndexWriterOnDiskFull.addDoc(TestIndexWriterOnDiskFull.java:539)
> at
> org.apache.lucene.index.TestIndexWriterOnDiskFull.testAddDocumentOnDiskFull(TestIndexWriterOnDiskFull.java:74)
> at
> org.apache.lucene.util.LuceneTestCase$LuceneTestCaseRunner.runChild(LuceneTestCase.java:1277)
> at
> org.apache.lucene.util.LuceneTestCase$LuceneTestCaseRunner.runChild(LuceneTestCase.java:1195)
> {noformat}
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