/// <exception cref="System.IO.IOException"/>
public virtual void Map(Text key, LongWritable value, OutputCollector <K, LongWritable
> collector, Reporter reporter)
{
string name = key.ToString();
long size = value.Get();
long seed = long.Parse(name);
if (size == 0)
{
return;
}
reporter.SetStatus("opening " + name);
FSDataInputStream @in = fs.Open(new Path(DataDir, name));
try
{
for (int i = 0; i < SeeksPerFile; i++)
{
// generate a random position
long position = Math.Abs(random.NextLong()) % size;
// seek file to that position
reporter.SetStatus("seeking " + name);
@in.Seek(position);
byte b = @in.ReadByte();
// check that byte matches
byte checkByte = 0;
// advance random state to that position
random.SetSeed(seed);
for (int p = 0; p <= position; p += check.Length)
{
reporter.SetStatus("generating data for " + name);
if (fastCheck)
{
checkByte = unchecked ((byte)random.Next(byte.MaxValue));
}
else
{
random.NextBytes(check);
checkByte = check[(int)(position % check.Length)];
}
}
NUnit.Framework.Assert.AreEqual(b, checkByte);
}
}
finally
{
@in.Close();
}
}