public virtual void TestCorruptedIFile()
{
int fetcher = 7;
Path onDiskMapOutputPath = new Path(name.GetMethodName() + "/foo");
Path shuffledToDisk = OnDiskMapOutput.GetTempPath(onDiskMapOutputPath, fetcher);
fs = FileSystem.GetLocal(job).GetRaw();
MapOutputFile mof = Org.Mockito.Mockito.Mock <MapOutputFile>();
OnDiskMapOutput <Text, Text> odmo = new OnDiskMapOutput <Text, Text>(map1ID, id, mm
, 100L, job, mof, fetcher, true, fs, onDiskMapOutputPath);
string mapData = "MAPDATA12345678901234567890";
ShuffleHeader header = new ShuffleHeader(map1ID.ToString(), 14, 10, 1);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bout);
IFileOutputStream ios = new IFileOutputStream(dos);
header.Write(dos);
int headerSize = dos.Size();
try
{
ios.Write(Sharpen.Runtime.GetBytesForString(mapData));
}
finally
{
ios.Close();
}
int dataSize = bout.Size() - headerSize;
// Ensure that the OnDiskMapOutput shuffler can successfully read the data.
MapHost host = new MapHost("TestHost", "http://test/url");
ByteArrayInputStream bin = new ByteArrayInputStream(bout.ToByteArray());
try
{
// Read past the shuffle header.
bin.Read(new byte[headerSize], 0, headerSize);
odmo.Shuffle(host, bin, dataSize, dataSize, metrics, Reporter.Null);
}
finally
{
bin.Close();
}
// Now corrupt the IFile data.
byte[] corrupted = bout.ToByteArray();
corrupted[headerSize + (dataSize / 2)] = unchecked ((int)(0x0));
try
{
bin = new ByteArrayInputStream(corrupted);
// Read past the shuffle header.
bin.Read(new byte[headerSize], 0, headerSize);
odmo.Shuffle(host, bin, dataSize, dataSize, metrics, Reporter.Null);
NUnit.Framework.Assert.Fail("OnDiskMapOutput.shuffle didn't detect the corrupted map partition file"
);
}
catch (ChecksumException e)
{
Log.Info("The expected checksum exception was thrown.", e);
}
finally
{
bin.Close();
}
// Ensure that the shuffled file can be read.
IFileInputStream iFin = new IFileInputStream(fs.Open(shuffledToDisk), dataSize, job
);
try
{
iFin.Read(new byte[dataSize], 0, dataSize);
}
finally
{
iFin.Close();
}
}
