/// <summary>Test using the gzip codec for reading</summary>
/// <exception cref="System.IO.IOException"/>
public static void TestGzip()
{
JobConf job = new JobConf();
CompressionCodec gzip = new GzipCodec();
ReflectionUtils.SetConf(gzip, job);
localFs.Delete(workDir, true);
WriteFile(localFs, new Path(workDir, "part1.txt.gz"), gzip, "line-1\tthe quick\nline-2\tbrown\nline-3\tfox jumped\nline-4\tover\nline-5\t the lazy\nline-6\t dog\n"
);
WriteFile(localFs, new Path(workDir, "part2.txt.gz"), gzip, "line-1\tthis is a test\nline-1\tof gzip\n"
);
FileInputFormat.SetInputPaths(job, workDir);
KeyValueTextInputFormat format = new KeyValueTextInputFormat();
format.Configure(job);
InputSplit[] splits = format.GetSplits(job, 100);
NUnit.Framework.Assert.AreEqual("compressed splits == 2", 2, splits.Length);
FileSplit tmp = (FileSplit)splits[0];
if (tmp.GetPath().GetName().Equals("part2.txt.gz"))
{
splits[0] = splits[1];
splits[1] = tmp;
}
IList <Text> results = ReadSplit(format, splits[0], job);
NUnit.Framework.Assert.AreEqual("splits[0] length", 6, results.Count);
NUnit.Framework.Assert.AreEqual("splits[0][5]", " dog", results[5].ToString());
results = ReadSplit(format, splits[1], job);
NUnit.Framework.Assert.AreEqual("splits[1] length", 2, results.Count);
NUnit.Framework.Assert.AreEqual("splits[1][0]", "this is a test", results[0].ToString
());
NUnit.Framework.Assert.AreEqual("splits[1][1]", "of gzip", results[1].ToString());
}
/// <exception cref="System.IO.IOException"/>
private static IList <Text> ReadSplit(KeyValueTextInputFormat format, InputSplit split
, JobConf job)
{
IList <Text> result = new AList <Text>();
RecordReader <Text, Text> reader = null;
try
{
reader = format.GetRecordReader(split, job, voidReporter);
Text key = reader.CreateKey();
Text value = reader.CreateValue();
while (reader.Next(key, value))
{
result.AddItem(value);
value = (Text)reader.CreateValue();
}
}
finally
{
if (reader != null)
{
reader.Close();
}
}
return(result);
}
/// <exception cref="System.Exception"/>
public virtual void TestFormat()
{
JobConf job = new JobConf();
Path file = new Path(workDir, "test.txt");
// A reporter that does nothing
Reporter reporter = Reporter.Null;
int seed = new Random().Next();
Log.Info("seed = " + seed);
Random random = new Random(seed);
localFs.Delete(workDir, true);
FileInputFormat.SetInputPaths(job, workDir);
// for a variety of lengths
for (int length = 0; length < MaxLength; length += random.Next(MaxLength / 10) +
1)
{
Log.Debug("creating; entries = " + length);
// create a file with length entries
TextWriter writer = new OutputStreamWriter(localFs.Create(file));
try
{
for (int i = 0; i < length; i++)
{
writer.Write(Sharpen.Extensions.ToString(i * 2));
writer.Write("\t");
writer.Write(Sharpen.Extensions.ToString(i));
writer.Write("\n");
}
}
finally
{
writer.Close();
}
// try splitting the file in a variety of sizes
KeyValueTextInputFormat format = new KeyValueTextInputFormat();
format.Configure(job);
for (int i_1 = 0; i_1 < 3; i_1++)
{
int numSplits = random.Next(MaxLength / 20) + 1;
Log.Debug("splitting: requesting = " + numSplits);
InputSplit[] splits = format.GetSplits(job, numSplits);
Log.Debug("splitting: got = " + splits.Length);
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.Length; j++)
{
Log.Debug("split[" + j + "]= " + splits[j]);
RecordReader <Text, Text> reader = format.GetRecordReader(splits[j], job, reporter
);
Type readerClass = reader.GetType();
NUnit.Framework.Assert.AreEqual("reader class is KeyValueLineRecordReader.", typeof(
KeyValueLineRecordReader), readerClass);
Text key = reader.CreateKey();
Type keyClass = key.GetType();
Text value = reader.CreateValue();
Type valueClass = value.GetType();
NUnit.Framework.Assert.AreEqual("Key class is Text.", typeof(Text), keyClass);
NUnit.Framework.Assert.AreEqual("Value class is Text.", typeof(Text), valueClass);
try
{
int count = 0;
while (reader.Next(key, value))
{
int v = System.Convert.ToInt32(value.ToString());
Log.Debug("read " + v);
if (bits.Get(v))
{
Log.Warn("conflict with " + v + " in split " + j + " at position " + reader.GetPos
());
}
NUnit.Framework.Assert.IsFalse("Key in multiple partitions.", bits.Get(v));
bits.Set(v);
count++;
}
Log.Debug("splits[" + j + "]=" + splits[j] + " count=" + count);
}
finally
{
reader.Close();
}
}
NUnit.Framework.Assert.AreEqual("Some keys in no partition.", length, bits.Cardinality
());
}
}
}
