public virtual void TestWriterAfterCrash()
{
IndexWriter writer = InitIndex();
MockRAMDirectory dir = (MockRAMDirectory)writer.GetDirectory();
dir.SetPreventDoubleWrite(false);
Crash(writer);
writer = InitIndex(dir);
writer.Close();
IndexReader reader = IndexReader.Open(dir);
Assert.IsTrue(reader.NumDocs() < 314);
}
/// <summary> Make sure if modifier tries to commit but hits disk full that modifier
/// remains consistent and usable. Similar to TestIndexReader.testDiskFull().
/// </summary>
private void TestOperationsOnDiskFull(bool updates)
{
bool debug = false;
Term searchTerm = new Term("content", "aaa");
int START_COUNT = 157;
int END_COUNT = 144;
for (int pass = 0; pass < 2; pass++)
{
bool autoCommit = (0 == pass);
// First build up a starting index:
MockRAMDirectory startDir = new MockRAMDirectory();
IndexWriter writer = new IndexWriter(startDir, autoCommit, new WhitespaceAnalyzer(), true);
for (int i = 0; i < 157; i++)
{
Document d = new Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES, Field.Index.NOT_ANALYZED));
d.Add(new Field("content", "aaa " + i, Field.Store.NO, Field.Index.ANALYZED));
writer.AddDocument(d);
}
writer.Close();
long diskUsage = startDir.SizeInBytes();
long diskFree = diskUsage + 10;
System.IO.IOException err = null;
bool done = false;
// Iterate w/ ever increasing free disk space:
while (!done)
{
MockRAMDirectory dir = new MockRAMDirectory(startDir);
dir.SetPreventDoubleWrite(false);
IndexWriter modifier = new IndexWriter(dir, autoCommit, new WhitespaceAnalyzer());
modifier.SetMaxBufferedDocs(1000); // use flush or close
modifier.SetMaxBufferedDeleteTerms(1000); // use flush or close
// For each disk size, first try to commit against
// dir that will hit random IOExceptions & disk
// full; after, give it infinite disk space & turn
// off random IOExceptions & retry w/ same reader:
bool success = false;
for (int x = 0; x < 2; x++)
{
double rate = 0.1;
double diskRatio = ((double) diskFree) / diskUsage;
long thisDiskFree;
System.String testName;
if (0 == x)
{
thisDiskFree = diskFree;
if (diskRatio >= 2.0)
{
rate /= 2;
}
if (diskRatio >= 4.0)
{
rate /= 2;
}
if (diskRatio >= 6.0)
{
rate = 0.0;
}
if (debug)
{
System.Console.Out.WriteLine("\ncycle: " + diskFree + " bytes");
}
testName = "disk full during reader.close() @ " + thisDiskFree + " bytes";
}
else
{
thisDiskFree = 0;
rate = 0.0;
if (debug)
{
System.Console.Out.WriteLine("\ncycle: same writer: unlimited disk space");
}
testName = "reader re-use after disk full";
}
dir.SetMaxSizeInBytes(thisDiskFree);
dir.SetRandomIOExceptionRate(rate, diskFree);
try
{
if (0 == x)
{
int docId = 12;
for (int i = 0; i < 13; i++)
{
if (updates)
{
Document d = new Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES, Field.Index.NOT_ANALYZED));
d.Add(new Field("content", "bbb " + i, Field.Store.NO, Field.Index.ANALYZED));
modifier.UpdateDocument(new Term("id", System.Convert.ToString(docId)), d);
}
else
{
// deletes
modifier.DeleteDocuments(new Term("id", System.Convert.ToString(docId)));
// modifier.setNorm(docId, "contents", (float)2.0);
}
docId += 12;
}
}
modifier.Close();
success = true;
if (0 == x)
{
done = true;
}
}
catch (System.IO.IOException e)
{
if (debug)
{
System.Console.Out.WriteLine(" hit IOException: " + e);
System.Console.Out.WriteLine(e.StackTrace);
}
err = e;
if (1 == x)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + " hit IOException after disk space was freed up");
}
}
// If the close() succeeded, make sure there are
// no unreferenced files.
if (success)
{
Lucene.Net.Util._TestUtil.CheckIndex(dir);
TestIndexWriter.AssertNoUnreferencedFiles(dir, "after writer.close");
}
// Finally, verify index is not corrupt, and, if
// we succeeded, we see all docs changed, and if
// we failed, we see either all docs or no docs
// changed (transactional semantics):
IndexReader newReader = null;
try
{
newReader = IndexReader.Open(dir);
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ":exception when creating IndexReader after disk full during close: " + e);
}
IndexSearcher searcher = new IndexSearcher(newReader);
ScoreDoc[] hits = null;
try
{
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).ScoreDocs;
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ": exception when searching: " + e);
}
int result2 = hits.Length;
if (success)
{
if (x == 0 && result2 != END_COUNT)
{
Assert.Fail(testName + ": method did not throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + END_COUNT);
}
else if (x == 1 && result2 != START_COUNT && result2 != END_COUNT)
{
// It's possible that the first exception was
// "recoverable" wrt pending deletes, in which
// case the pending deletes are retained and
// then re-flushing (with plenty of disk
// space) will succeed in flushing the
// deletes:
Assert.Fail(testName + ": method did not throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + START_COUNT + " or " + END_COUNT);
}
}
else
{
// On hitting exception we still may have added
// all docs:
if (result2 != START_COUNT && result2 != END_COUNT)
{
System.Console.Error.WriteLine(err.StackTrace);
Assert.Fail(testName + ": method did throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + START_COUNT + " or " + END_COUNT);
}
}
searcher.Close();
newReader.Close();
if (result2 == END_COUNT)
{
break;
}
}
dir.Close();
// Try again with 10 more bytes of free space:
diskFree += 10;
}
}
}
public virtual void TestDiskFull()
{
bool debug = false;
Term searchTerm = new Term("content", "aaa");
int START_COUNT = 157;
int END_COUNT = 144;
// First build up a starting index:
RAMDirectory startDir = new MockRAMDirectory();
IndexWriter writer = new IndexWriter(startDir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
for (int i = 0; i < 157; i++)
{
Document d = new Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES, Field.Index.NOT_ANALYZED));
d.Add(new Field("content", "aaa " + i, Field.Store.NO, Field.Index.ANALYZED));
writer.AddDocument(d);
}
writer.Close();
long diskUsage = startDir.SizeInBytes();
long diskFree = diskUsage + 100;
System.IO.IOException err = null;
bool done = false;
// Iterate w/ ever increasing free disk space:
while (!done)
{
MockRAMDirectory dir = new MockRAMDirectory(startDir);
// If IndexReader hits disk full, it can write to
// the same files again.
dir.SetPreventDoubleWrite(false);
IndexReader reader = IndexReader.Open(dir, false);
// For each disk size, first try to commit against
// dir that will hit random IOExceptions & disk
// full; after, give it infinite disk space & turn
// off random IOExceptions & retry w/ same reader:
bool success = false;
for (int x = 0; x < 2; x++)
{
double rate = 0.05;
double diskRatio = ((double) diskFree) / diskUsage;
long thisDiskFree;
System.String testName;
if (0 == x)
{
thisDiskFree = diskFree;
if (diskRatio >= 2.0)
{
rate /= 2;
}
if (diskRatio >= 4.0)
{
rate /= 2;
}
if (diskRatio >= 6.0)
{
rate = 0.0;
}
if (debug)
{
System.Console.Out.WriteLine("\ncycle: " + diskFree + " bytes");
}
testName = "disk full during reader.close() @ " + thisDiskFree + " bytes";
}
else
{
thisDiskFree = 0;
rate = 0.0;
if (debug)
{
System.Console.Out.WriteLine("\ncycle: same writer: unlimited disk space");
}
testName = "reader re-use after disk full";
}
dir.SetMaxSizeInBytes(thisDiskFree);
dir.SetRandomIOExceptionRate(rate, diskFree);
try
{
if (0 == x)
{
int docId = 12;
for (int i = 0; i < 13; i++)
{
reader.DeleteDocument(docId);
reader.SetNorm(docId, "contents", (float) 2.0);
docId += 12;
}
}
reader.Close();
success = true;
if (0 == x)
{
done = true;
}
}
catch (System.IO.IOException e)
{
if (debug)
{
System.Console.Out.WriteLine(" hit IOException: " + e);
System.Console.Out.WriteLine(e.StackTrace);
}
err = e;
if (1 == x)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + " hit IOException after disk space was freed up");
}
}
// Whether we succeeded or failed, check that all
// un-referenced files were in fact deleted (ie,
// we did not create garbage). Just create a
// new IndexFileDeleter, have it delete
// unreferenced files, then verify that in fact
// no files were deleted:
System.String[] startFiles = dir.ListAll();
SegmentInfos infos = new SegmentInfos();
infos.Read(dir);
new IndexFileDeleter(dir, new KeepOnlyLastCommitDeletionPolicy(), infos, null, null,null);
System.String[] endFiles = dir.ListAll();
System.Array.Sort(startFiles);
System.Array.Sort(endFiles);
//for(int i=0;i<startFiles.length;i++) {
// System.out.println(" startFiles: " + i + ": " + startFiles[i]);
//}
if (!CollectionsHelper.Equals(startFiles, endFiles))
{
System.String successStr;
if (success)
{
successStr = "success";
}
else
{
successStr = "IOException";
System.Console.Error.WriteLine(err.StackTrace);
}
Assert.Fail("reader.close() failed to delete unreferenced files after " + successStr + " (" + diskFree + " bytes): before delete:\n " + ArrayToString(startFiles) + "\n after delete:\n " + ArrayToString(endFiles));
}
// Finally, verify index is not corrupt, and, if
// we succeeded, we see all docs changed, and if
// we failed, we see either all docs or no docs
// changed (transactional semantics):
IndexReader newReader = null;
try
{
newReader = IndexReader.Open(dir, false);
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ":exception when creating IndexReader after disk full during close: " + e);
}
/*
int result = newReader.docFreq(searchTerm);
if (success) {
if (result != END_COUNT) {
fail(testName + ": method did not throw exception but docFreq('aaa') is " + result + " instead of expected " + END_COUNT);
}
} else {
// On hitting exception we still may have added
// all docs:
if (result != START_COUNT && result != END_COUNT) {
err.printStackTrace();
fail(testName + ": method did throw exception but docFreq('aaa') is " + result + " instead of expected " + START_COUNT + " or " + END_COUNT);
}
}
*/
IndexSearcher searcher = new IndexSearcher(newReader);
ScoreDoc[] hits = null;
try
{
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).ScoreDocs;
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ": exception when searching: " + e);
}
int result2 = hits.Length;
if (success)
{
if (result2 != END_COUNT)
{
Assert.Fail(testName + ": method did not throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + END_COUNT);
}
}
else
{
// On hitting exception we still may have added
// all docs:
if (result2 != START_COUNT && result2 != END_COUNT)
{
System.Console.Error.WriteLine(err.StackTrace);
Assert.Fail(testName + ": method did throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + START_COUNT);
}
}
searcher.Close();
newReader.Close();
if (result2 == END_COUNT)
{
break;
}
}
dir.Close();
// Try again with 10 more bytes of free space:
diskFree += 10;
}
startDir.Close();
}
public virtual void TestIndexReaderUnDeleteAll()
{
MockRAMDirectory dir = new MockRAMDirectory();
dir.SetPreventDoubleWrite(false);
IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), IndexWriter.MaxFieldLength.UNLIMITED);
writer.AddDocument(CreateDocument("a"));
writer.AddDocument(CreateDocument("b"));
writer.AddDocument(CreateDocument("c"));
writer.Close();
IndexReader reader = IndexReader.Open(dir, false);
reader.DeleteDocuments(new Term("id", "a"));
reader.Flush();
reader.DeleteDocuments(new Term("id", "b"));
reader.UndeleteAll();
reader.DeleteDocuments(new Term("id", "b"));
reader.Close();
IndexReader.Open(dir, false).Close();
dir.Close();
}
/// <summary> Make sure if modifier tries to commit but hits disk full that modifier
/// remains consistent and usable. Similar to TestIndexReader.testDiskFull().
/// </summary>
private void TestOperationsOnDiskFull(bool updates)
{
bool debug = false;
Term searchTerm = new Term("content", "aaa");
int START_COUNT = 157;
int END_COUNT = 144;
// First build up a starting index:
MockRAMDirectory startDir = new MockRAMDirectory();
IndexWriter writer = new IndexWriter(startDir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.UNLIMITED, null);
for (int i = 0; i < 157; i++)
{
Document d = new Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES, Field.Index.NOT_ANALYZED));
d.Add(new Field("content", "aaa " + i, Field.Store.NO, Field.Index.ANALYZED));
writer.AddDocument(d, null);
}
writer.Close();
long diskUsage = startDir.SizeInBytes();
long diskFree = diskUsage + 10;
System.IO.IOException err = null;
bool done = false;
// Iterate w/ ever increasing free disk space:
while (!done)
{
MockRAMDirectory dir = new MockRAMDirectory(startDir);
dir.SetPreventDoubleWrite(false);
IndexWriter modifier = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED, null);
modifier.SetMaxBufferedDocs(1000); // use flush or close
modifier.SetMaxBufferedDeleteTerms(1000); // use flush or close
// For each disk size, first try to commit against
// dir that will hit random IOExceptions & disk
// full; after, give it infinite disk space & turn
// off random IOExceptions & retry w/ same reader:
bool success = false;
for (int x = 0; x < 2; x++)
{
double rate = 0.1;
double diskRatio = ((double)diskFree) / diskUsage;
long thisDiskFree;
System.String testName;
if (0 == x)
{
thisDiskFree = diskFree;
if (diskRatio >= 2.0)
{
rate /= 2;
}
if (diskRatio >= 4.0)
{
rate /= 2;
}
if (diskRatio >= 6.0)
{
rate = 0.0;
}
if (debug)
{
System.Console.Out.WriteLine("\ncycle: " + diskFree + " bytes");
}
testName = "disk full during reader.close() @ " + thisDiskFree + " bytes";
}
else
{
thisDiskFree = 0;
rate = 0.0;
if (debug)
{
System.Console.Out.WriteLine("\ncycle: same writer: unlimited disk space");
}
testName = "reader re-use after disk full";
}
dir.SetMaxSizeInBytes(thisDiskFree);
dir.SetRandomIOExceptionRate(rate, diskFree);
try
{
if (0 == x)
{
int docId = 12;
for (int i = 0; i < 13; i++)
{
if (updates)
{
Document d = new Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES,
Field.Index.NOT_ANALYZED));
d.Add(new Field("content", "bbb " + i, Field.Store.NO, Field.Index.ANALYZED));
modifier.UpdateDocument(new Term("id", System.Convert.ToString(docId)), d, null);
}
else
{
// deletes
modifier.DeleteDocuments(null, new Term("id", System.Convert.ToString(docId)));
// modifier.setNorm(docId, "contents", (float)2.0);
}
docId += 12;
}
}
modifier.Close();
success = true;
if (0 == x)
{
done = true;
}
}
catch (System.IO.IOException e)
{
if (debug)
{
System.Console.Out.WriteLine(" hit IOException: " + e);
System.Console.Out.WriteLine(e.StackTrace);
}
err = e;
if (1 == x)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + " hit IOException after disk space was freed up");
}
}
// If the close() succeeded, make sure there are
// no unreferenced files.
if (success)
{
Lucene.Net.Util._TestUtil.CheckIndex(dir);
TestIndexWriter.AssertNoUnreferencedFiles(dir, "after writer.close");
}
// Finally, verify index is not corrupt, and, if
// we succeeded, we see all docs changed, and if
// we failed, we see either all docs or no docs
// changed (transactional semantics):
IndexReader newReader = null;
try
{
newReader = IndexReader.Open((Directory)dir, true, null);
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ":exception when creating IndexReader after disk full during close: " + e);
}
IndexSearcher searcher = new IndexSearcher(newReader);
ScoreDoc[] hits = null;
try
{
hits = searcher.Search(new TermQuery(searchTerm), null, 1000, null).ScoreDocs;
}
catch (System.IO.IOException e)
{
System.Console.Error.WriteLine(e.StackTrace);
Assert.Fail(testName + ": exception when searching: " + e);
}
int result2 = hits.Length;
if (success)
{
if (x == 0 && result2 != END_COUNT)
{
Assert.Fail(testName +
": method did not throw exception but hits.length for search on term 'aaa' is " +
result2 + " instead of expected " + END_COUNT);
}
else if (x == 1 && result2 != START_COUNT && result2 != END_COUNT)
{
// It's possible that the first exception was
// "recoverable" wrt pending deletes, in which
// case the pending deletes are retained and
// then re-flushing (with plenty of disk
// space) will succeed in flushing the
// deletes:
Assert.Fail(testName +
": method did not throw exception but hits.length for search on term 'aaa' is " +
result2 + " instead of expected " + START_COUNT + " or " + END_COUNT);
}
}
else
{
// On hitting exception we still may have added
// all docs:
if (result2 != START_COUNT && result2 != END_COUNT)
{
System.Console.Error.WriteLine(err.StackTrace);
Assert.Fail(testName + ": method did throw exception but hits.length for search on term 'aaa' is " +
result2 + " instead of expected " + START_COUNT + " or " + END_COUNT);
}
}
searcher.Close();
newReader.Close();
if (result2 == END_COUNT)
{
break;
}
}
dir.Close();
// Try again with 10 more bytes of free space:
diskFree += 10;
}
}
public virtual void TestPrepareCommitRollback()
{
MockRAMDirectory dir = new MockRAMDirectory();
dir.SetPreventDoubleWrite(false);
IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.LIMITED);
writer.SetMaxBufferedDocs(2);
writer.SetMergeFactor(5);
for (int i = 0; i < 23; i++)
AddDoc(writer);
IndexReader reader = IndexReader.Open(dir);
Assert.AreEqual(0, reader.NumDocs());
writer.PrepareCommit();
IndexReader reader2 = IndexReader.Open(dir);
Assert.AreEqual(0, reader2.NumDocs());
writer.Rollback();
IndexReader reader3 = reader.Reopen();
Assert.AreEqual(0, reader.NumDocs());
Assert.AreEqual(0, reader2.NumDocs());
Assert.AreEqual(0, reader3.NumDocs());
reader.Close();
reader2.Close();
writer = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.LIMITED);
for (int i = 0; i < 17; i++)
AddDoc(writer);
Assert.AreEqual(0, reader3.NumDocs());
reader3.Close();
reader = IndexReader.Open(dir);
Assert.AreEqual(0, reader.NumDocs());
reader.Close();
writer.PrepareCommit();
reader = IndexReader.Open(dir);
Assert.AreEqual(0, reader.NumDocs());
reader.Close();
writer.Commit();
reader = IndexReader.Open(dir);
Assert.AreEqual(17, reader.NumDocs());
reader.Close();
writer.Close();
dir.Close();
}
public virtual void TestCommitOnCloseAbort()
{
MockRAMDirectory dir = new MockRAMDirectory();
IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
writer.SetMaxBufferedDocs(10);
for (int i = 0; i < 14; i++)
{
AddDoc(writer);
}
writer.Close();
Term searchTerm = new Term("content", "aaa");
IndexSearcher searcher = new IndexSearcher(dir);
ScoreDoc[] hits = searcher.Search(new TermQuery(searchTerm), null, 1000).scoreDocs;
Assert.AreEqual(14, hits.Length, "first number of hits");
searcher.Close();
writer = new IndexWriter(dir, new WhitespaceAnalyzer(), false, IndexWriter.MaxFieldLength.LIMITED);
writer.SetMaxBufferedDocs(10);
for (int j = 0; j < 17; j++)
{
AddDoc(writer);
}
// Delete all docs:
writer.DeleteDocuments(searchTerm);
searcher = new IndexSearcher(dir);
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).scoreDocs;
Assert.AreEqual(14, hits.Length, "reader incorrectly sees changes from writer with autoCommit disabled");
searcher.Close();
// Now, close the writer:
writer.Abort();
AssertNoUnreferencedFiles(dir, "unreferenced files remain after abort()");
searcher = new IndexSearcher(dir);
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).scoreDocs;
Assert.AreEqual(14, hits.Length, "saw changes after writer.abort");
searcher.Close();
// Now make sure we can re-open the index, add docs,
// and all is good:
writer = new IndexWriter(dir, new WhitespaceAnalyzer(), false, IndexWriter.MaxFieldLength.LIMITED);
writer.SetMaxBufferedDocs(10);
// On abort, writer in fact may write to the same
// segments_N file:
dir.SetPreventDoubleWrite(false);
for (int i = 0; i < 12; i++)
{
for (int j = 0; j < 17; j++)
{
AddDoc(writer);
}
searcher = new IndexSearcher(dir);
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).scoreDocs;
Assert.AreEqual(14, hits.Length, "reader incorrectly sees changes from writer with autoCommit disabled");
searcher.Close();
}
writer.Close();
searcher = new IndexSearcher(dir);
hits = searcher.Search(new TermQuery(searchTerm), null, 1000).scoreDocs;
Assert.AreEqual(218, hits.Length, "didn't see changes after close");
searcher.Close();
dir.Close();
}
public void TestCorruptionAfterDiskFullDuringMerge()
{
MockRAMDirectory dir = new MockRAMDirectory();
dir.SetPreventDoubleWrite(false);
IndexWriter w = new IndexWriter(dir, new WhitespaceAnalyzer(), IndexWriter.MaxFieldLength.UNLIMITED);
w.SetMergeScheduler(new SerialMergeScheduler());
((LogMergePolicy)w.GetMergePolicy()).SetMergeFactor(2);
Document doc = new Document();
doc.Add(new Field("f", "doctor who", Field.Store.YES, Field.Index.ANALYZED));
w.AddDocument(doc);
w.Commit();
w.DeleteDocuments(new Term("f", "who"));
w.AddDocument(doc);
// disk fills up!
FailTwiceDuringMerge ftdm = new FailTwiceDuringMerge();
ftdm.SetDoFail();
dir.FailOn(ftdm);
try
{
w.Commit();
Assert.Fail("fake disk full IOExceptions not hit");
}
catch (System.IO.IOException ioe)
{
// expected
Assert.IsTrue(ftdm.didFail1 || ftdm.didFail2);
}
_TestUtil.CheckIndex(dir);
ftdm.ClearDoFail();
w.AddDocument(doc);
w.Close();
_TestUtil.CheckIndex(dir);
dir.Close();
}