public Stream OpenFileStreamForAppend(string file)
{
_fileSystem = GetHdfsFileSystemConnection();
if (!_fileSystem.IsValid())
{
return(null);
}
_fileStream = _fileSystem.OpenFileStream(file, HdfsFileAccess.Append);
return(_fileStream.IsValid() ? _fileStream : null);
}
public Stream OpenFileStreamForAppend(string file)
{
_fileSystem = GetHdfsFileSystemConnection();
if (!_fileSystem.IsValid()) return null;
_fileStream = _fileSystem.OpenFileStream(file, HdfsFileAccess.Append);
return _fileStream.IsValid() ? _fileStream : null;
}
/// <summary>
/// Tests the FileStream Interface
/// </summary>
private static void FileTestStream(HdfsFileSystem hdfsSystem)
{
string localfilename = "MobileSampleData.txt";
string localfilepath = Path.GetFullPath(@"..\..\..\Sample") + @"\" + localfilename;
string localfilewrite = Path.GetFullPath(@"..\..\..\Sample") + @"\HdfsStream." + localfilename;
string localfileline = Path.GetFullPath(@"..\..\..\Sample") + @"\HdfsStreamLine." + localfilename;
string localfilestream = Path.GetFullPath(@"..\..\..\Sample") + @"\HdfsStreamCopy." + localfilename;
string filename = BaseHdfsPath + "/testdata.txt";
int chunksize = 1024;
int chunk;
// First write out some data
Console.WriteLine("Working Directory is: " + hdfsSystem.GetWorkingDirectory());
Console.WriteLine("Creating New File: " + filename);
string data = "I am some unstructured data.\nThat will be written.\n";
byte[] dataBytes = Encoding.UTF8.GetBytes(data);
int dataLen = dataBytes.Length;
using (HdfsFileStream file = hdfsSystem.OpenFileStream(filename, HdfsFileAccess.Write, chunksize))
{
file.Write(dataBytes, 0, data.Length);
file.WriteByte((byte)47);
file.Flush();
}
// Ensure you can read the data
using (HdfsFileStream file = hdfsSystem.OpenFileStream(filename, HdfsFileAccess.Read))
{
Console.WriteLine("Data Written:");
byte[] newDataBytes = new byte[dataLen];
file.Read(newDataBytes, 0, newDataBytes.Length);
Console.Write(Encoding.UTF8.GetString(newDataBytes));
Console.WriteLine();
Console.WriteLine("Setting file times and owner to be 'isotope'");
file.Chown("isotope", null);
file.SetTimes(DateTime.Now.AddDays(-2), DateTime.Now.AddDays(-1));
HdfsFileInfoEntry fileinfo = file.GetInformation();
if (fileinfo != null)
{
Console.WriteLine(string.Format(@"'{0}', Modified/Accessed:""{1:G}, {2:G}"", Owner:""{3}""", fileinfo.Name, fileinfo.LastModified, fileinfo.LastAccessed, fileinfo.Owner));
}
}
// Read the full contents of a file using bytes
Console.WriteLine();
Console.WriteLine("Reading all Byte Data:");
byte[] readBytes = new byte[chunksize];
using (HdfsFileStream file = hdfsSystem.OpenFileStream(filename, HdfsFileAccess.Read))
{
while ((chunk = file.Read(readBytes, 0, chunksize)) > 0)
{
Console.Write(Encoding.UTF8.GetString(readBytes, 0, chunk));
}
}
if (File.Exists(localfilepath))
{
// Copy a file from the local file system into Hadoop
Console.WriteLine();
Console.WriteLine("Copying Local File: " + localfilename);
byte[] localbytes = new byte[chunksize];
string localhdfsfilename = BaseHdfsPath + @"\" + localfilename;
using (HdfsFileStream file = hdfsSystem.OpenFileStream(localhdfsfilename, HdfsFileAccess.Write, chunksize))
{
using (FileStream stream = new FileStream(localfilepath, FileMode.Open, FileAccess.Read))
{
while ((chunk = stream.Read(localbytes, 0, chunksize)) > 0)
{
file.Write(localbytes, 0, chunk);
}
}
file.Flush();
}
using (HdfsFileStream file = hdfsSystem.OpenFileStream(localhdfsfilename, HdfsFileAccess.Write, chunksize))
{
using (FileStream stream = new FileStream(localfilepath, FileMode.Open, FileAccess.Read))
{
stream.CopyTo(file);
}
}
// Copy the HDFS file to the local system
Console.WriteLine();
Console.WriteLine("Copying file to local:");
using (HdfsFileStream file = hdfsSystem.OpenFileStream(localhdfsfilename, HdfsFileAccess.Read, chunksize))
{
using (FileStream stream = new FileStream(localfilewrite, FileMode.Create, FileAccess.Write))
{
while ((chunk = file.Read(readBytes, 0, chunksize)) > 0)
{
stream.Write(readBytes, 0, chunk);
}
}
}
Console.WriteLine(String.Format("File '{0}' Created.", localfilewrite));
// Copy the HDFS file to the local system using ReadLine
Console.WriteLine();
Console.WriteLine("Copying file to local using ReadLine:");
using (StreamReader reader = new StreamReader(hdfsSystem.OpenFileStream(localhdfsfilename, HdfsFileAccess.Read, chunksize)))
{
using (StreamWriter writer = new StreamWriter(localfileline, false, Encoding.UTF8))
{
string line;
while ((line = reader.ReadLine()) != null)
{
writer.WriteLine(line);
}
}
}
Console.WriteLine(String.Format("File '{0}' Created.", localfileline));
// Now process using Stream Copy To interfaces
Console.WriteLine();
Console.WriteLine("Copying file to local using stream:");
using (HdfsFileStream hdfsStream = hdfsSystem.OpenFileStream(localhdfsfilename, HdfsFileAccess.Read))
{
using (FileStream fileStream = new FileStream(localfilestream, FileMode.Create, FileAccess.Write))
{
hdfsStream.CopyTo(fileStream);
}
}
Console.WriteLine(String.Format("File '{0}' Created.", localfilestream));
Console.WriteLine();
}
}
