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);
for (int i = 0; i < 157; i++)
{
Lucene.Net.Documents.Document d = new Lucene.Net.Documents.Document();
d.Add(new Field("id", System.Convert.ToString(i), Field.Store.YES, Field.Index.UN_TOKENIZED));
d.Add(new Field("content", "aaa " + i, Field.Store.NO, Field.Index.TOKENIZED));
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);
IndexReader reader = IndexReader.Open(dir);
// 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);
}
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.List();
SegmentInfos infos = new SegmentInfos();
infos.Read(dir);
IndexFileDeleter d = new IndexFileDeleter(dir, new KeepOnlyLastCommitDeletionPolicy(), infos, null, null);
System.String[] endFiles = dir.List();
System.Array.Sort(startFiles);
System.Array.Sort(endFiles);
//for(int i=0;i<startFiles.length;i++) {
// System.out.println(" startFiles: " + i + ": " + startFiles[i]);
//}
if (SupportClass.Compare.CompareStringArrays(startFiles, endFiles) == false)
{
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);
}
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);
Hits hits = null;
try
{
hits = searcher.Search(new TermQuery(searchTerm));
}
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();
}
