/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override RecordWriter <K, V> GetRecordWriter(TaskAttemptContext job)
{
Configuration conf = job.GetConfiguration();
bool isCompressed = GetCompressOutput(job);
string keyValueSeparator = conf.Get(Seperator, "\t");
CompressionCodec codec = null;
string extension = string.Empty;
if (isCompressed)
{
Type codecClass = GetOutputCompressorClass(job, typeof(GzipCodec));
codec = (CompressionCodec)ReflectionUtils.NewInstance(codecClass, conf);
extension = codec.GetDefaultExtension();
}
Path file = GetDefaultWorkFile(job, extension);
FileSystem fs = file.GetFileSystem(conf);
if (!isCompressed)
{
FSDataOutputStream fileOut = fs.Create(file, false);
return(new TextOutputFormat.LineRecordWriter <K, V>(fileOut, keyValueSeparator));
}
else
{
FSDataOutputStream fileOut = fs.Create(file, false);
return(new TextOutputFormat.LineRecordWriter <K, V>(new DataOutputStream(codec.CreateOutputStream
(fileOut)), keyValueSeparator));
}
}
/// <exception cref="System.IO.IOException"/>
public override RecordWriter <K, V> GetRecordWriter(FileSystem ignored, JobConf job
, string name, Progressable progress)
{
bool isCompressed = GetCompressOutput(job);
string keyValueSeparator = job.Get("mapreduce.output.textoutputformat.separator",
"\t");
if (!isCompressed)
{
Path file = FileOutputFormat.GetTaskOutputPath(job, name);
FileSystem fs = file.GetFileSystem(job);
FSDataOutputStream fileOut = fs.Create(file, progress);
return(new TextOutputFormat.LineRecordWriter <K, V>(fileOut, keyValueSeparator));
}
else
{
Type codecClass = GetOutputCompressorClass(job, typeof(GzipCodec));
// create the named codec
CompressionCodec codec = ReflectionUtils.NewInstance(codecClass, job);
// build the filename including the extension
Path file = FileOutputFormat.GetTaskOutputPath(job, name + codec.GetDefaultExtension
());
FileSystem fs = file.GetFileSystem(job);
FSDataOutputStream fileOut = fs.Create(file, progress);
return(new TextOutputFormat.LineRecordWriter <K, V>(new DataOutputStream(codec.CreateOutputStream
(fileOut)), keyValueSeparator));
}
}
public virtual void TestSplitableCodecs()
{
Job job = Job.GetInstance(defaultConf);
Configuration conf = job.GetConfiguration();
// Create the codec
CompressionCodec codec = null;
try
{
codec = (CompressionCodec)ReflectionUtils.NewInstance(conf.GetClassByName("org.apache.hadoop.io.compress.BZip2Codec"
), conf);
}
catch (TypeLoadException)
{
throw new IOException("Illegal codec!");
}
Path file = new Path(workDir, "test" + codec.GetDefaultExtension());
int seed = new Random().Next();
Log.Info("seed = " + seed);
Random random = new Random(seed);
localFs.Delete(workDir, true);
FileInputFormat.SetInputPaths(job, workDir);
int MaxLength = 500000;
FileInputFormat.SetMaxInputSplitSize(job, MaxLength / 20);
// for a variety of lengths
for (int length = 0; length < MaxLength; length += random.Next(MaxLength / 4) + 1)
{
Log.Info("creating; entries = " + length);
// create a file with length entries
TextWriter writer = new OutputStreamWriter(codec.CreateOutputStream(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();
NUnit.Framework.Assert.IsTrue("KVTIF claims not splittable", format.IsSplitable(job
, file));
for (int i_1 = 0; i_1 < 3; i_1++)
{
int numSplits = random.Next(MaxLength / 2000) + 1;
Log.Info("splitting: requesting = " + numSplits);
IList <InputSplit> splits = format.GetSplits(job);
Log.Info("splitting: got = " + splits.Count);
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.Count; j++)
{
Log.Debug("split[" + j + "]= " + splits[j]);
TaskAttemptContext context = MapReduceTestUtil.CreateDummyMapTaskAttemptContext(job
.GetConfiguration());
RecordReader <Text, Text> reader = format.CreateRecordReader(splits[j], context);
Type clazz = reader.GetType();
MapContext <Text, Text, Text, Text> mcontext = new MapContextImpl <Text, Text, Text
, Text>(job.GetConfiguration(), context.GetTaskAttemptID(), reader, null, null,
MapReduceTestUtil.CreateDummyReporter(), splits[j]);
reader.Initialize(splits[j], mcontext);
Text key = null;
Text value = null;
try
{
int count = 0;
while (reader.NextKeyValue())
{
key = reader.GetCurrentKey();
value = reader.GetCurrentValue();
int k = System.Convert.ToInt32(key.ToString());
int v = System.Convert.ToInt32(value.ToString());
NUnit.Framework.Assert.AreEqual("Bad key", 0, k % 2);
NUnit.Framework.Assert.AreEqual("Mismatched key/value", k / 2, v);
Log.Debug("read " + k + "," + v);
NUnit.Framework.Assert.IsFalse(k + "," + v + " in multiple partitions.", bits.Get
(v));
bits.Set(v);
count++;
}
if (count > 0)
{
Log.Info("splits[" + j + "]=" + splits[j] + " count=" + count);
}
else
{
Log.Debug("splits[" + j + "]=" + splits[j] + " count=" + count);
}
}
finally
{
reader.Close();
}
}
NUnit.Framework.Assert.AreEqual("Some keys in no partition.", length, bits.Cardinality
());
}
}
}
/// <exception cref="System.IO.IOException"/>
public virtual void TestSplitableCodecs()
{
JobConf conf = new JobConf(defaultConf);
int seed = new Random().Next();
// Create the codec
CompressionCodec codec = null;
try
{
codec = (CompressionCodec)ReflectionUtils.NewInstance(conf.GetClassByName("org.apache.hadoop.io.compress.BZip2Codec"
), conf);
}
catch (TypeLoadException)
{
throw new IOException("Illegal codec!");
}
Path file = new Path(workDir, "test" + codec.GetDefaultExtension());
// A reporter that does nothing
Reporter reporter = Reporter.Null;
Log.Info("seed = " + seed);
Random random = new Random(seed);
FileSystem localFs = FileSystem.GetLocal(conf);
localFs.Delete(workDir, true);
FileInputFormat.SetInputPaths(conf, workDir);
int MaxLength = 500000;
// for a variety of lengths
for (int length = MaxLength / 2; length < MaxLength; length += random.Next(MaxLength
/ 4) + 1)
{
Log.Info("creating; entries = " + length);
// create a file with length entries
TextWriter writer = new OutputStreamWriter(codec.CreateOutputStream(localFs.Create
(file)));
try
{
for (int i = 0; i < length; i++)
{
writer.Write(Sharpen.Extensions.ToString(i));
writer.Write("\n");
}
}
finally
{
writer.Close();
}
// try splitting the file in a variety of sizes
TextInputFormat format = new TextInputFormat();
format.Configure(conf);
LongWritable key = new LongWritable();
Text value = new Text();
for (int i_1 = 0; i_1 < 3; i_1++)
{
int numSplits = random.Next(MaxLength / 2000) + 1;
Log.Info("splitting: requesting = " + numSplits);
InputSplit[] splits = format.GetSplits(conf, numSplits);
Log.Info("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 <LongWritable, Text> reader = format.GetRecordReader(splits[j], conf,
reporter);
try
{
int counter = 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);
counter++;
}
if (counter > 0)
{
Log.Info("splits[" + j + "]=" + splits[j] + " count=" + counter);
}
else
{
Log.Debug("splits[" + j + "]=" + splits[j] + " count=" + counter);
}
}
finally
{
reader.Close();
}
}
NUnit.Framework.Assert.AreEqual("Some keys in no partition.", length, bits.Cardinality
());
}
}
}