public void when_checkpoint_is_exactly_on_the_boundary_of_chunk_the_last_chunk_could_be_present()
{
var config = new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
100,
0,
new InMemoryCheckpoint(200),
new InMemoryCheckpoint(),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, "chunk-000000.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000001.000001"), config.ChunkSize, config.ChunkSize);
CreateOngoingChunk(Path.Combine(PathName, "chunk-000002.000000"), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(() => db.OpenVerifyAndClean(verifyHash: false));
Assert.IsNotNull(db.Manager.GetChunk(2));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000000.000000")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000001.000001")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000002.000000")));
Assert.AreEqual(3, Directory.GetFiles(PathName, "*").Length);
db.Dispose();
}
public void old_version_of_chunks_are_removed()
{
File.Create(Path.Combine(PathName, "foo")).Close();
File.Create(Path.Combine(PathName, "bla")).Close();
var config = new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
100,
0,
new InMemoryCheckpoint(400),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, "chunk-000000.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000000.000002"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000000.000005"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000001.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000001.000001"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000002.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000003.000007"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000003.000008"), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(db.OpenVerifyAndClean);
Assert.IsTrue(File.Exists(Path.Combine(PathName, "foo")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "bla")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000000.000005")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000001.000001")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000002.000000")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000003.000008")));
Assert.AreEqual(6, Directory.GetFiles(PathName, "*").Length);
db.Dispose();
}
public void try_read_returns_false_when_writer_checkpoint_is_zero()
{
var writerchk = new InMemoryCheckpoint(0);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
10000,
0,
writerchk,
new InMemoryCheckpoint(),
new InMemoryCheckpoint(-1),
new InMemoryCheckpoint(-1)));
db.Open();
var chaser = new TFChunkChaser(db, writerchk, new InMemoryCheckpoint());
chaser.Open();
LogRecord record;
Assert.IsFalse(chaser.TryReadNext(out record));
chaser.Close();
db.Dispose();
}
public void with_a_writer_checksum_of_zero_and_no_files_is_valid()
{
var db = new TFChunkDb(TFChunkHelper.CreateDbConfig(PathName, 0));
Assert.DoesNotThrow(() => db.Open());
db.Dispose();
}
public void temporary_files_are_removed()
{
var config = new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
100,
0,
new InMemoryCheckpoint(150),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, "chunk-000000.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000001.000001"), config.ChunkSize, config.ChunkSize);
File.Create(Path.Combine(PathName, "bla")).Close();
File.Create(Path.Combine(PathName, "bla.scavenge.tmp")).Close();
File.Create(Path.Combine(PathName, "bla.tmp")).Close();
Assert.DoesNotThrow(db.OpenVerifyAndClean);
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000000.000000")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000001.000001")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "bla")));
Assert.AreEqual(3, Directory.GetFiles(PathName, "*").Length);
db.Dispose();
}
public void Dispose()
{
//epochManager?.Dispose();
//reader?.Dispose();
_writer?.Dispose();
_db?.Dispose();
}
public override Task TestFixtureTearDown()
{
_logFormat?.Dispose();
_db.Dispose();
return(base.TestFixtureTearDown());
}
public void try_read_returns_false_when_writer_checksum_is_equal_to_reader_checksum()
{
var writerchk = new InMemoryCheckpoint();
var chaserchk = new InMemoryCheckpoint(Checkpoint.Chaser, 0);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
writerchk,
chaserchk,
new[] { writerchk, chaserchk }));
db.OpenVerifyAndClean();
writerchk.Write(12);
writerchk.Flush();
chaserchk.Write(12);
chaserchk.Flush();
var chaser = new TFChunkChaser(db, writerchk, chaserchk);
chaser.Open();
LogRecord record;
Assert.IsFalse(chaser.TryReadNext(out record));
Assert.AreEqual(12, chaserchk.Read());
chaser.Close();
db.Dispose();
}
public void when_checkpoint_is_on_boundary_of_new_chunk_excessive_last_chunks_are_removed_if_present_and_new_empty_one_is_created()
{
var config = new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
100,
0,
new InMemoryCheckpoint(200),
new InMemoryCheckpoint(),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, "chunk-000000.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000001.000001"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000002.000000"), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, "chunk-000002.000001"), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(() => db.OpenVerifyAndClean(verifyHash: false));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000000.000000")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000001.000001")));
Assert.IsTrue(File.Exists(Path.Combine(PathName, "chunk-000002.000000")));
Assert.AreEqual(3, Directory.GetFiles(PathName, "*").Length);
db.Dispose();
}
public void with_a_writer_checksum_of_nonzero_and_no_files_a_corrupted_database_exception_is_thrown()
{
var db = new TFChunkDb(TFChunkHelper.CreateDbConfig(PathName, 500));
var exc = Assert.Throws <CorruptDatabaseException>(() => db.Open());
Assert.IsInstanceOf <ChunkNotFoundException>(exc.InnerException);
db.Dispose();
}
public virtual async Task DisposeAsync()
{
await _node.StopAsync();
_db.Dispose();
await _host.StopAsync();
_host.Dispose();
Client.Dispose();
}
public void a_record_can_be_written()
{
var filename = Path.Combine(PathName, "prefix.tf0");
var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, 0);
var chunkBytes = chunkHeader.AsByteArray();
var buf = new byte[ChunkHeader.Size + ChunkFooter.Size + chunkHeader.ChunkSize];
Buffer.BlockCopy(chunkBytes, 0, buf, 0, chunkBytes.Length);
File.WriteAllBytes(filename, buf);
_checkpoint = new InMemoryCheckpoint(137);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
chunkHeader.ChunkSize,
0,
_checkpoint,
new ICheckpoint[0]));
db.OpenVerifyAndClean();
var writer = new TFChunkWriter(db);
var record = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 0,
transactionOffset: 0,
eventStreamId: "WorldEnding",
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[8000],
metadata: new byte[] { 7, 17 });
Console.WriteLine(record.GetSizeWithLengthPrefixAndSuffix());
Console.WriteLine(record.GetSizeWithLengthPrefixAndSuffix() + 137);
long pos;
Assert.IsTrue(writer.Write(record, out pos));
writer.Close();
db.Dispose();
Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read());
using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
{
filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
var reader = new BinaryReader(filestream);
var read = LogRecord.ReadFrom(reader);
Console.WriteLine(string.Join("\n", Directory.EnumerateFiles(PathName)));
Assert.AreEqual(record, read);
}
}
public void a_record_can_be_written()
{
var filename = GetFilePathFor("chunk-000000.000000");
var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, false, Guid.NewGuid());
var chunkBytes = chunkHeader.AsByteArray();
var buf = new byte[ChunkHeader.Size + ChunkFooter.Size + chunkHeader.ChunkSize];
Buffer.BlockCopy(chunkBytes, 0, buf, 0, chunkBytes.Length);
File.WriteAllBytes(filename, buf);
_checkpoint = new InMemoryCheckpoint(137);
var db = new TFChunkDb(TFChunkHelper.CreateDbConfig(PathName, _checkpoint, new InMemoryCheckpoint(),
chunkSize: chunkHeader.ChunkSize));
db.Open();
var
bytes = new byte[3994]; // this gives exactly 4097 size of record, with 3993 (rec size 4096) everything works fine!
new Random().NextBytes(bytes);
var writer = new TFChunkWriter(db);
var logFormat = LogFormatHelper <TLogFormat, TStreamId> .LogFormat;
logFormat.StreamNameIndex.GetOrAddId("WorldEnding", out var streamId, out _, out _);
var record = LogRecord.Prepare(
factory: logFormat.RecordFactory,
logPosition: 137,
correlationId: _correlationId,
eventId: _eventId,
transactionPos: 789,
transactionOffset: 543,
eventStreamId: streamId,
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.SingleWrite,
eventType: "type",
data: bytes,
metadata: new byte[] { 0x07, 0x17 });
long pos;
Assert.IsTrue(writer.Write(record, out pos));
writer.Close();
db.Dispose();
Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read());
using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read)) {
filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
var reader = new BinaryReader(filestream);
var read = LogRecord.ReadFrom(reader, (int)reader.BaseStream.Length);
Assert.AreEqual(record, read);
}
}
public void Dispose()
{
//epochManager?.Dispose();
//reader?.Dispose();
try {
_writer?.Dispose();
} catch {
//workaround for TearDown error
}
_db?.Dispose();
}
public void Shutdown()
{
_node.Stop();
Thread.Sleep(2000);
_chaserChk.Dispose();
_writerChk.Dispose();
_tfChunkDb.Dispose();
TryDeleteDirectory(_oneTimeDbPath);
}
public void a_record_can_be_written()
{
var filename = Path.Combine(PathName, "prefix.tf0");
var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, 0);
var chunkBytes = chunkHeader.AsByteArray();
var buf = new byte[ChunkHeader.Size + ChunkFooter.Size + chunkHeader.ChunkSize];
Buffer.BlockCopy(chunkBytes, 0, buf, 0, chunkBytes.Length);
File.WriteAllBytes(filename, buf);
_checkpoint = new InMemoryCheckpoint(137);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
chunkHeader.ChunkSize,
0,
_checkpoint,
new InMemoryCheckpoint(),
new ICheckpoint[0]));
db.OpenVerifyAndClean();
var bytes = new byte[3994]; // this gives exactly 4097 size of record, with 3993 (rec size 4096) everything works fine!
new Random().NextBytes(bytes);
var writer = new TFChunkWriter(db);
var record = new PrepareLogRecord(logPosition: 123,
correlationId: _correlationId,
eventId: _eventId,
transactionPosition: 789,
transactionOffset: 543,
eventStreamId: "WorldEnding",
expectedVersion: 1234,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.SingleWrite,
eventType: "type",
data: bytes,
metadata: new byte[] { 0x07, 0x17 });
long pos;
Assert.IsTrue(writer.Write(record, out pos));
writer.Close();
db.Dispose();
Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read());
using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
{
filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
var reader = new BinaryReader(filestream);
var read = LogRecord.ReadFrom(reader);
Assert.AreEqual(record, read);
}
}
public override void TestFixtureTearDown()
{
ReadIndex.Close();
ReadIndex.Dispose();
TableIndex.Close();
Db.Close();
Db.Dispose();
base.TestFixtureTearDown();
}
public override Task TestFixtureTearDown()
{
ReadIndex.Close();
ReadIndex.Dispose();
_tableIndex.Close();
_db.Close();
_db.Dispose();
return(base.TestFixtureTearDown());
}
public void with_a_writer_checksum_of_zero_and_no_files_is_valid()
{
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(0),
new ICheckpoint[0]));
Assert.DoesNotThrow(() => db.OpenVerifyAndClean());
db.Dispose();
}
public void allows_no_files_when_checkpoint_is_zero()
{
var config = new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
Assert.DoesNotThrow(db.OpenVerifyAndClean);
db.Dispose();
}
public override Task TestFixtureTearDown()
{
_logFormat?.Dispose();
ReadIndex?.Close();
ReadIndex?.Dispose();
TableIndex?.Close();
Db?.Close();
Db?.Dispose();
return(base.TestFixtureTearDown());
}
public void with_a_writer_checksum_of_nonzero_and_no_files_a_corrupted_database_exception_is_thrown()
{
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(500),
new ICheckpoint[0]));
var exc = Assert.Throws <CorruptDatabaseException>(() => db.OpenVerifyAndClean());
Assert.IsInstanceOf <ChunkNotFoundException>(exc.InnerException);
db.Dispose();
}
public void with_a_writer_checksum_of_zero_and_no_files_is_valid()
{
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
10000,
0,
new InMemoryCheckpoint(0),
new InMemoryCheckpoint(),
new InMemoryCheckpoint(-1),
new InMemoryCheckpoint(-1)));
Assert.DoesNotThrow(() => db.Open());
db.Dispose();
}
public void a_record_can_be_written()
{
var filename = Path.Combine(PathName, "prefix.tf0");
var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, 0);
var chunkBytes = chunkHeader.AsByteArray();
var bytes = new byte[ChunkHeader.Size + 10000 + ChunkFooter.Size];
Buffer.BlockCopy(chunkBytes, 0, bytes, 0, chunkBytes.Length);
File.WriteAllBytes(filename, bytes);
_checkpoint = new InMemoryCheckpoint(137);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
_checkpoint,
new InMemoryCheckpoint(),
new ICheckpoint[0]));
db.OpenVerifyAndClean();
var tf = new TFChunkWriter(db);
var record = new PrepareLogRecord(logPosition: 0,
correlationId: _correlationId,
eventId: _eventId,
expectedVersion: 1234,
transactionPosition: 0,
transactionOffset: 0,
eventStreamId: "WorldEnding",
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: "type",
data: new byte[] { 1, 2, 3, 4, 5 },
metadata: new byte[] { 7, 17 });
long tmp;
tf.Write(record, out tmp);
//tf.Flush();
tf.Close();
db.Dispose();
Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137, _checkpoint.Read()); //137 is fluff assigned to beginning of checkpoint
//TODO actually read the event
using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read))
{
filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
var reader = new BinaryReader(filestream);
var read = LogRecord.ReadFrom(reader);
Assert.AreEqual(record, read);
}
}
public void with_a_writer_checksum_of_zero_the_first_chunk_is_created_with_correct_name_and_is_aligned()
{
var config = TFChunkHelper.CreateDbConfig(PathName, 0);
var db = new TFChunkDb(config);
db.Open();
db.Dispose();
Assert.AreEqual(1, Directory.GetFiles(PathName).Length);
Assert.IsTrue(File.Exists(GetFilePathFor("chunk-000000.000000")));
var fileInfo = new FileInfo(GetFilePathFor("chunk-000000.000000"));
Assert.AreEqual(12288, fileInfo.Length);
}
public void allows_first_correct_file_when_checkpoint_is_zero()
{
var config = new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, config.FileNamingStrategy.GetFilenameFor(0)), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(db.OpenVerifyAndClean);
db.Dispose();
}
public void allows_with_exactly_enough_file_to_reach_checksum()
{
var config = new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(10000),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, config.FileNamingStrategy.GetFilenameFor(0)), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(db.OpenVerifyAndClean);
db.Dispose();
}
public void a_record_can_be_written()
{
var filename = GetFilePathFor("chunk-000000.000000");
var chunkHeader = new ChunkHeader(TFChunk.CurrentChunkVersion, 10000, 0, 0, false, chunkId: Guid.NewGuid());
var chunkBytes = chunkHeader.AsByteArray();
var bytes = new byte[ChunkHeader.Size + 10000 + ChunkFooter.Size];
Buffer.BlockCopy(chunkBytes, 0, bytes, 0, chunkBytes.Length);
File.WriteAllBytes(filename, bytes);
_checkpoint = new InMemoryCheckpoint(137);
var db = new TFChunkDb(TFChunkHelper.CreateDbConfig(PathName, _checkpoint, new InMemoryCheckpoint()));
db.Open();
var recordFactory = LogFormatHelper <TLogFormat, TStreamId> .RecordFactory;
var streamId = LogFormatHelper <TLogFormat, TStreamId> .StreamId;
var eventTypeId = LogFormatHelper <TLogFormat, TStreamId> .EventTypeId;
var tf = new TFChunkWriter(db);
var record = LogRecord.Prepare(
factory: recordFactory,
logPosition: _checkpoint.Read(),
correlationId: _correlationId,
eventId: _eventId,
expectedVersion: 1234,
transactionPos: 0,
transactionOffset: 0,
eventStreamId: streamId,
timeStamp: new DateTime(2012, 12, 21),
flags: PrepareFlags.None,
eventType: eventTypeId,
data: new byte[] { 1, 2, 3, 4, 5 },
metadata: new byte[] { 7, 17 });
long tmp;
tf.Write(record, out tmp);
tf.Close();
db.Dispose();
Assert.AreEqual(record.GetSizeWithLengthPrefixAndSuffix() + 137,
_checkpoint.Read()); //137 is fluff assigned to beginning of checkpoint
using (var filestream = File.Open(filename, FileMode.Open, FileAccess.Read)) {
filestream.Seek(ChunkHeader.Size + 137 + sizeof(int), SeekOrigin.Begin);
var reader = new BinaryReader(filestream);
var read = LogRecord.ReadFrom(reader, (int)reader.BaseStream.Length);
Assert.AreEqual(record, read);
}
}
public void allows_next_new_chunk_when_checksum_is_exactly_in_between_two_chunks()
{
var config = new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(10000),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, config.FileNamingStrategy.GetFilenameFor(0)), config.ChunkSize, config.ChunkSize);
CreateChunk(Path.Combine(PathName, config.FileNamingStrategy.GetFilenameFor(1)), config.ChunkSize, config.ChunkSize);
Assert.DoesNotThrow(db.OpenVerifyAndClean);
db.Dispose();
}
public void with_not_enough_files_to_reach_checksum_throws()
{
var config = new TFChunkDbConfig(PathName,
new PrefixFileNamingStrategy(PathName, "prefix.tf"),
10000,
0,
new InMemoryCheckpoint(15000),
new ICheckpoint[0]);
var db = new TFChunkDb(config);
CreateChunk(Path.Combine(PathName, config.FileNamingStrategy.GetFilenameFor(0)), config.ChunkSize, config.ChunkSize);
var exc = Assert.Throws <CorruptDatabaseException>(db.OpenVerifyAndClean);
Assert.IsInstanceOf <ChunkNotFoundException>(exc.InnerException);
db.Dispose();
}