/// <summary>
/// Calculate the md5sum of an image after zeroing out the transaction ID
/// field in the header.
/// </summary>
/// <remarks>
/// Calculate the md5sum of an image after zeroing out the transaction ID
/// field in the header. This is useful for tests that want to verify
/// that two checkpoints have identical namespaces.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
public static string GetImageFileMD5IgnoringTxId(FilePath imageFile)
{
FilePath tmpFile = FilePath.CreateTempFile("hadoop_imagefile_tmp", "fsimage");
tmpFile.DeleteOnExit();
try
{
Files.Copy(imageFile, tmpFile);
RandomAccessFile raf = new RandomAccessFile(tmpFile, "rw");
try
{
raf.Seek(ImageTxidPos);
raf.WriteLong(0);
}
finally
{
IOUtils.CloseStream(raf);
}
return(GetFileMD5(tmpFile));
}
finally
{
tmpFile.Delete();
}
}
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());
}
