/// <summary>Find out where the edit log ends.</summary>
/// <remarks>
/// Find out where the edit log ends.
/// This will update the lastTxId of the EditLogFile or
/// mark it as corrupt if it is.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
public virtual void ValidateLog()
{
FSEditLogLoader.EditLogValidation val = EditLogFileInputStream.ValidateEditLog(file
);
this.lastTxId = val.GetEndTxId();
this.hasCorruptHeader = val.HasCorruptHeader();
}
public virtual void TestValidateEmptyEditLog()
{
FilePath testDir = new FilePath(TestDir, "testValidateEmptyEditLog");
SortedDictionary <long, long> offsetToTxId = Maps.NewTreeMap();
FilePath logFile = PrepareUnfinalizedTestEditLog(testDir, 0, offsetToTxId);
// Truncate the file so that there is nothing except the header and
// layout flags section.
TruncateFile(logFile, 8);
FSEditLogLoader.EditLogValidation validation = EditLogFileInputStream.ValidateEditLog
(logFile);
NUnit.Framework.Assert.IsTrue(!validation.HasCorruptHeader());
NUnit.Framework.Assert.AreEqual(HdfsConstants.InvalidTxid, validation.GetEndTxId(
));
}
public virtual void TestValidateEditLogWithCorruptBody()
{
FilePath testDir = new FilePath(TestDir, "testValidateEditLogWithCorruptBody");
SortedDictionary <long, long> offsetToTxId = Maps.NewTreeMap();
int NumTxns = 20;
FilePath logFile = PrepareUnfinalizedTestEditLog(testDir, NumTxns, offsetToTxId);
// Back up the uncorrupted log
FilePath logFileBak = new FilePath(testDir, logFile.GetName() + ".bak");
Files.Copy(logFile, logFileBak);
FSEditLogLoader.EditLogValidation validation = EditLogFileInputStream.ValidateEditLog
(logFile);
NUnit.Framework.Assert.IsTrue(!validation.HasCorruptHeader());
// We expect that there will be an OP_START_LOG_SEGMENT, followed by
// NUM_TXNS opcodes, followed by an OP_END_LOG_SEGMENT.
NUnit.Framework.Assert.AreEqual(NumTxns + 1, validation.GetEndTxId());
// Corrupt each edit and verify that validation continues to work
foreach (KeyValuePair <long, long> entry in offsetToTxId)
{
long txOffset = entry.Key;
long txId = entry.Value;
// Restore backup, corrupt the txn opcode
Files.Copy(logFileBak, logFile);
CorruptByteInFile(logFile, txOffset);
validation = EditLogFileInputStream.ValidateEditLog(logFile);
long expectedEndTxId = (txId == (NumTxns + 1)) ? NumTxns : (NumTxns + 1);
NUnit.Framework.Assert.AreEqual("Failed when corrupting txn opcode at " + txOffset
, expectedEndTxId, validation.GetEndTxId());
NUnit.Framework.Assert.IsTrue(!validation.HasCorruptHeader());
}
// Truncate right before each edit and verify that validation continues
// to work
foreach (KeyValuePair <long, long> entry_1 in offsetToTxId)
{
long txOffset = entry_1.Key;
long txId = entry_1.Value;
// Restore backup, corrupt the txn opcode
Files.Copy(logFileBak, logFile);
TruncateFile(logFile, txOffset);
validation = EditLogFileInputStream.ValidateEditLog(logFile);
long expectedEndTxId = (txId == 0) ? HdfsConstants.InvalidTxid : (txId - 1);
NUnit.Framework.Assert.AreEqual("Failed when corrupting txid " + txId + " txn opcode "
+ "at " + txOffset, expectedEndTxId, validation.GetEndTxId());
NUnit.Framework.Assert.IsTrue(!validation.HasCorruptHeader());
}
}
public virtual void TestValidateEditLogWithCorruptHeader()
{
FilePath testDir = new FilePath(TestDir, "testValidateEditLogWithCorruptHeader");
SortedDictionary <long, long> offsetToTxId = Maps.NewTreeMap();
FilePath logFile = PrepareUnfinalizedTestEditLog(testDir, 2, offsetToTxId);
RandomAccessFile rwf = new RandomAccessFile(logFile, "rw");
try
{
rwf.Seek(0);
rwf.WriteLong(42);
}
finally
{
// corrupt header
rwf.Close();
}
FSEditLogLoader.EditLogValidation validation = EditLogFileInputStream.ValidateEditLog
(logFile);
NUnit.Framework.Assert.IsTrue(validation.HasCorruptHeader());
}