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
Fix For: 3.4, 4.0
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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