/// <summary>Write the given object to the stream.</summary>
/// <remarks>
/// Write the given object to the stream. If it is a Text or BytesWritable,
/// write it directly. Otherwise, write it to a buffer and then write the
/// length and data to the stream.
/// </remarks>
/// <param name="obj">the object to write</param>
/// <exception cref="System.IO.IOException"/>
private void WriteObject(Writable obj)
{
// For Text and BytesWritable, encode them directly, so that they end up
// in C++ as the natural translations.
if (obj is Text)
{
Text t = (Text)obj;
int len = t.GetLength();
WritableUtils.WriteVInt(stream, len);
stream.Write(t.GetBytes(), 0, len);
}
else
{
if (obj is BytesWritable)
{
BytesWritable b = (BytesWritable)obj;
int len = b.GetLength();
WritableUtils.WriteVInt(stream, len);
stream.Write(b.GetBytes(), 0, len);
}
else
{
buffer.Reset();
obj.Write(buffer);
int length = buffer.GetLength();
WritableUtils.WriteVInt(stream, length);
stream.Write(buffer.GetData(), 0, length);
}
}
}
private static byte[] Pair(BytesWritable a, BytesWritable b)
{
byte[] pairData = new byte[a.GetLength() + b.GetLength()];
System.Array.Copy(a.GetBytes(), 0, pairData, 0, a.GetLength());
System.Array.Copy(b.GetBytes(), 0, pairData, a.GetLength(), b.GetLength());
return(pairData);
}
/// <summary>Advance to the next key/value pair.</summary>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override bool NextKeyValue()
{
if (!hasMore)
{
key = null;
value = null;
return(false);
}
firstValue = !nextKeyIsSame;
DataInputBuffer nextKey = input.GetKey();
currentRawKey.Set(nextKey.GetData(), nextKey.GetPosition(), nextKey.GetLength() -
nextKey.GetPosition());
buffer.Reset(currentRawKey.GetBytes(), 0, currentRawKey.GetLength());
key = keyDeserializer.Deserialize(key);
DataInputBuffer nextVal = input.GetValue();
buffer.Reset(nextVal.GetData(), nextVal.GetPosition(), nextVal.GetLength() - nextVal
.GetPosition());
value = valueDeserializer.Deserialize(value);
currentKeyLength = nextKey.GetLength() - nextKey.GetPosition();
currentValueLength = nextVal.GetLength() - nextVal.GetPosition();
if (isMarked)
{
backupStore.Write(nextKey, nextVal);
}
hasMore = input.Next();
if (hasMore)
{
nextKey = input.GetKey();
nextKeyIsSame = comparator.Compare(currentRawKey.GetBytes(), 0, currentRawKey.GetLength
(), nextKey.GetData(), nextKey.GetPosition(), nextKey.GetLength() - nextKey.GetPosition
()) == 0;
}
else
{
nextKeyIsSame = false;
}
inputValueCounter.Increment(1);
return(true);
}
/// <exception cref="System.IO.IOException"/>
private static void CreateBigMapInputFile(Configuration conf, FileSystem fs, Path
dir, long fileSizeInMB)
{
// Check if the input path exists and is non-empty
if (fs.Exists(dir))
{
FileStatus[] list = fs.ListStatus(dir);
if (list.Length > 0)
{
throw new IOException("Input path: " + dir + " already exists... ");
}
}
Path file = new Path(dir, "part-0");
SequenceFile.Writer writer = SequenceFile.CreateWriter(fs, conf, file, typeof(BytesWritable
), typeof(BytesWritable), SequenceFile.CompressionType.None);
long numBytesToWrite = fileSizeInMB * 1024 * 1024;
int minKeySize = conf.GetInt(MinKey, 10);
int keySizeRange = conf.GetInt(MaxKey, 1000) - minKeySize;
int minValueSize = conf.GetInt(MinValue, 0);
int valueSizeRange = conf.GetInt(MaxValue, 20000) - minValueSize;
BytesWritable randomKey = new BytesWritable();
BytesWritable randomValue = new BytesWritable();
Log.Info("Writing " + numBytesToWrite + " bytes to " + file + " with " + "minKeySize: "
+ minKeySize + " keySizeRange: " + keySizeRange + " minValueSize: " + minValueSize
+ " valueSizeRange: " + valueSizeRange);
long start = Runtime.CurrentTimeMillis();
while (numBytesToWrite > 0)
{
int keyLength = minKeySize + (keySizeRange != 0 ? random.Next(keySizeRange) : 0);
randomKey.SetSize(keyLength);
RandomizeBytes(randomKey.GetBytes(), 0, randomKey.GetLength());
int valueLength = minValueSize + (valueSizeRange != 0 ? random.Next(valueSizeRange
) : 0);
randomValue.SetSize(valueLength);
RandomizeBytes(randomValue.GetBytes(), 0, randomValue.GetLength());
writer.Append(randomKey, randomValue);
numBytesToWrite -= keyLength + valueLength;
}
writer.Close();
long end = Runtime.CurrentTimeMillis();
Log.Info("Created " + file + " of size: " + fileSizeInMB + "MB in " + (end - start
) / 1000 + "secs");
}
/// <exception cref="System.IO.IOException"/>
private static IList <string> ReadSplit(FixedLengthInputFormat format, InputSplit
split, JobConf job)
{
IList <string> result = new AList <string>();
RecordReader <LongWritable, BytesWritable> reader = format.GetRecordReader(split,
job, voidReporter);
LongWritable key = reader.CreateKey();
BytesWritable value = reader.CreateValue();
try
{
while (reader.Next(key, value))
{
result.AddItem(Sharpen.Runtime.GetStringForBytes(value.GetBytes(), 0, value.GetLength
()));
}
}
finally
{
reader.Close();
}
return(result);
}
/// <exception cref="System.IO.IOException"/>
protected internal virtual void WriteObject(Writable obj, DataOutputStream stream
)
{
// For Text and BytesWritable, encode them directly, so that they end up
// in C++ as the natural translations.
DataOutputBuffer buffer = new DataOutputBuffer();
if (obj is Text)
{
Text t = (Text)obj;
int len = t.GetLength();
WritableUtils.WriteVLong(stream, len);
stream.Flush();
stream.Write(t.GetBytes(), 0, len);
stream.Flush();
}
else
{
if (obj is BytesWritable)
{
BytesWritable b = (BytesWritable)obj;
int len = b.GetLength();
WritableUtils.WriteVLong(stream, len);
stream.Write(b.GetBytes(), 0, len);
}
else
{
buffer.Reset();
obj.Write(buffer);
int length = buffer.GetLength();
WritableUtils.WriteVInt(stream, length);
stream.Write(buffer.GetData(), 0, length);
}
}
stream.Flush();
}
/// <exception cref="System.IO.IOException"/>
private void RunRandomTests(CompressionCodec codec)
{
StringBuilder fileName = new StringBuilder("testFormat.txt");
if (codec != null)
{
fileName.Append(".gz");
}
localFs.Delete(workDir, true);
Path file = new Path(workDir, fileName.ToString());
int seed = new Random().Next();
Log.Info("Seed = " + seed);
Random random = new Random(seed);
int MaxTests = 20;
LongWritable key = new LongWritable();
BytesWritable value = new BytesWritable();
for (int i = 0; i < MaxTests; i++)
{
Log.Info("----------------------------------------------------------");
// Maximum total records of 999
int totalRecords = random.Next(999) + 1;
// Test an empty file
if (i == 8)
{
totalRecords = 0;
}
// Maximum bytes in a record of 100K
int recordLength = random.Next(1024 * 100) + 1;
// For the 11th test, force a record length of 1
if (i == 10)
{
recordLength = 1;
}
// The total bytes in the test file
int fileSize = (totalRecords * recordLength);
Log.Info("totalRecords=" + totalRecords + " recordLength=" + recordLength);
// Create the job
JobConf job = new JobConf(defaultConf);
if (codec != null)
{
ReflectionUtils.SetConf(codec, job);
}
// Create the test file
AList <string> recordList = CreateFile(file, codec, recordLength, totalRecords);
NUnit.Framework.Assert.IsTrue(localFs.Exists(file));
//set the fixed length record length config property for the job
FixedLengthInputFormat.SetRecordLength(job, recordLength);
int numSplits = 1;
// Arbitrarily set number of splits.
if (i > 0)
{
if (i == (MaxTests - 1))
{
// Test a split size that is less than record len
numSplits = (int)(fileSize / Math.Floor(recordLength / 2));
}
else
{
if (MaxTests % i == 0)
{
// Let us create a split size that is forced to be
// smaller than the end file itself, (ensures 1+ splits)
numSplits = fileSize / (fileSize - random.Next(fileSize));
}
else
{
// Just pick a random split size with no upper bound
numSplits = Math.Max(1, fileSize / random.Next(int.MaxValue));
}
}
Log.Info("Number of splits set to: " + numSplits);
}
// Setup the input path
FileInputFormat.SetInputPaths(job, workDir);
// Try splitting the file in a variety of sizes
FixedLengthInputFormat format = new FixedLengthInputFormat();
format.Configure(job);
InputSplit[] splits = format.GetSplits(job, numSplits);
Log.Info("Actual number of splits = " + splits.Length);
// Test combined split lengths = total file size
long recordOffset = 0;
int recordNumber = 0;
foreach (InputSplit split in splits)
{
RecordReader <LongWritable, BytesWritable> reader = format.GetRecordReader(split,
job, voidReporter);
Type clazz = reader.GetType();
NUnit.Framework.Assert.AreEqual("RecordReader class should be FixedLengthRecordReader:"
, typeof(FixedLengthRecordReader), clazz);
// Plow through the records in this split
while (reader.Next(key, value))
{
NUnit.Framework.Assert.AreEqual("Checking key", (long)(recordNumber * recordLength
), key.Get());
string valueString = Sharpen.Runtime.GetStringForBytes(value.GetBytes(), 0, value
.GetLength());
NUnit.Framework.Assert.AreEqual("Checking record length:", recordLength, value.GetLength
());
NUnit.Framework.Assert.IsTrue("Checking for more records than expected:", recordNumber
< totalRecords);
string origRecord = recordList[recordNumber];
NUnit.Framework.Assert.AreEqual("Checking record content:", origRecord, valueString
);
recordNumber++;
}
reader.Close();
}
NUnit.Framework.Assert.AreEqual("Total original records should be total read records:"
, recordList.Count, recordNumber);
}
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public virtual void TestBinary()
{
Job job = Job.GetInstance();
FileSystem fs = FileSystem.GetLocal(job.GetConfiguration());
Path dir = new Path(Runtime.GetProperty("test.build.data", ".") + "/mapred");
Path file = new Path(dir, "testbinary.seq");
Random r = new Random();
long seed = r.NextLong();
r.SetSeed(seed);
fs.Delete(dir, true);
FileInputFormat.SetInputPaths(job, dir);
Text tkey = new Text();
Text tval = new Text();
SequenceFile.Writer writer = new SequenceFile.Writer(fs, job.GetConfiguration(),
file, typeof(Text), typeof(Text));
try
{
for (int i = 0; i < Records; ++i)
{
tkey.Set(Sharpen.Extensions.ToString(r.Next(), 36));
tval.Set(System.Convert.ToString(r.NextLong(), 36));
writer.Append(tkey, tval);
}
}
finally
{
writer.Close();
}
TaskAttemptContext context = MapReduceTestUtil.CreateDummyMapTaskAttemptContext(job
.GetConfiguration());
InputFormat <BytesWritable, BytesWritable> bformat = new SequenceFileAsBinaryInputFormat
();
int count = 0;
r.SetSeed(seed);
BytesWritable bkey = new BytesWritable();
BytesWritable bval = new BytesWritable();
Text cmpkey = new Text();
Text cmpval = new Text();
DataInputBuffer buf = new DataInputBuffer();
FileInputFormat.SetInputPaths(job, file);
foreach (InputSplit split in bformat.GetSplits(job))
{
RecordReader <BytesWritable, BytesWritable> reader = bformat.CreateRecordReader(split
, context);
MapContext <BytesWritable, BytesWritable, BytesWritable, BytesWritable> mcontext =
new MapContextImpl <BytesWritable, BytesWritable, BytesWritable, BytesWritable>(job
.GetConfiguration(), context.GetTaskAttemptID(), reader, null, null, MapReduceTestUtil
.CreateDummyReporter(), split);
reader.Initialize(split, mcontext);
try
{
while (reader.NextKeyValue())
{
bkey = reader.GetCurrentKey();
bval = reader.GetCurrentValue();
tkey.Set(Sharpen.Extensions.ToString(r.Next(), 36));
tval.Set(System.Convert.ToString(r.NextLong(), 36));
buf.Reset(bkey.GetBytes(), bkey.GetLength());
cmpkey.ReadFields(buf);
buf.Reset(bval.GetBytes(), bval.GetLength());
cmpval.ReadFields(buf);
NUnit.Framework.Assert.IsTrue("Keys don't match: " + "*" + cmpkey.ToString() + ":"
+ tkey.ToString() + "*", cmpkey.ToString().Equals(tkey.ToString()));
NUnit.Framework.Assert.IsTrue("Vals don't match: " + "*" + cmpval.ToString() + ":"
+ tval.ToString() + "*", cmpval.ToString().Equals(tval.ToString()));
++count;
}
}
finally
{
reader.Close();
}
}
NUnit.Framework.Assert.AreEqual("Some records not found", Records, count);
}
/// <exception cref="Sharpen.DigestException"/>
private long MD5Hashcode(BytesWritable key)
{
return(MD5Hashcode(key.GetBytes(), 0, key.GetLength()));
}
public virtual void TestSortedLongWritable()
{
Configuration conf = new Configuration();
Path path = new Path(Root, name);
FileSystem fs = path.GetFileSystem(conf);
FSDataOutputStream @out = fs.Create(path);
try
{
TFile.Writer writer = new TFile.Writer(@out, BlockSize, "gz", jClassLongWritableComparator
, conf);
try
{
LongWritable key = new LongWritable(0);
for (long i = 0; i < Nentry; ++i)
{
key.Set(Cube(i - Nentry / 2));
DataOutputStream dos = writer.PrepareAppendKey(-1);
try
{
key.Write(dos);
}
finally
{
dos.Close();
}
dos = writer.PrepareAppendValue(-1);
try
{
dos.Write(Runtime.GetBytesForString(BuildValue(i)));
}
finally
{
dos.Close();
}
}
}
finally
{
writer.Close();
}
}
finally
{
@out.Close();
}
FSDataInputStream @in = fs.Open(path);
try
{
TFile.Reader reader = new TFile.Reader(@in, fs.GetFileStatus(path).GetLen(), conf
);
try
{
TFile.Reader.Scanner scanner = reader.CreateScanner();
long i = 0;
BytesWritable value = new BytesWritable();
for (; !scanner.AtEnd(); scanner.Advance())
{
scanner.Entry().GetValue(value);
Assert.Equal(BuildValue(i), Runtime.GetStringForBytes(
value.GetBytes(), 0, value.GetLength()));
++i;
}
}
finally
{
reader.Close();
}
}
finally
{
@in.Close();
}
}
/// <exception cref="System.IO.IOException"/>
public virtual void TestBinary()
{
JobConf job = new JobConf();
FileSystem fs = FileSystem.GetLocal(job);
Path dir = new Path(Runtime.GetProperty("test.build.data", ".") + "/mapred");
Path file = new Path(dir, "testbinary.seq");
Random r = new Random();
long seed = r.NextLong();
r.SetSeed(seed);
fs.Delete(dir, true);
FileInputFormat.SetInputPaths(job, dir);
Text tkey = new Text();
Text tval = new Text();
SequenceFile.Writer writer = new SequenceFile.Writer(fs, job, file, typeof(Text),
typeof(Text));
try
{
for (int i = 0; i < Records; ++i)
{
tkey.Set(Sharpen.Extensions.ToString(r.Next(), 36));
tval.Set(System.Convert.ToString(r.NextLong(), 36));
writer.Append(tkey, tval);
}
}
finally
{
writer.Close();
}
InputFormat <BytesWritable, BytesWritable> bformat = new SequenceFileAsBinaryInputFormat
();
int count = 0;
r.SetSeed(seed);
BytesWritable bkey = new BytesWritable();
BytesWritable bval = new BytesWritable();
Text cmpkey = new Text();
Text cmpval = new Text();
DataInputBuffer buf = new DataInputBuffer();
int NumSplits = 3;
FileInputFormat.SetInputPaths(job, file);
foreach (InputSplit split in bformat.GetSplits(job, NumSplits))
{
RecordReader <BytesWritable, BytesWritable> reader = bformat.GetRecordReader(split
, job, Reporter.Null);
try
{
while (reader.Next(bkey, bval))
{
tkey.Set(Sharpen.Extensions.ToString(r.Next(), 36));
tval.Set(System.Convert.ToString(r.NextLong(), 36));
buf.Reset(bkey.GetBytes(), bkey.GetLength());
cmpkey.ReadFields(buf);
buf.Reset(bval.GetBytes(), bval.GetLength());
cmpval.ReadFields(buf);
NUnit.Framework.Assert.IsTrue("Keys don't match: " + "*" + cmpkey.ToString() + ":"
+ tkey.ToString() + "*", cmpkey.ToString().Equals(tkey.ToString()));
NUnit.Framework.Assert.IsTrue("Vals don't match: " + "*" + cmpval.ToString() + ":"
+ tval.ToString() + "*", cmpval.ToString().Equals(tval.ToString()));
++count;
}
}
finally
{
reader.Close();
}
}
NUnit.Framework.Assert.AreEqual("Some records not found", Records, count);
}
/// <exception cref="System.IO.IOException"/>
public virtual void WriteUncompressedBytes(DataOutputStream outStream)
{
outStream.Write(value.GetBytes(), 0, value.GetLength());
}