/// <summary>Start a job to compute sigma</summary>
/// <exception cref="System.IO.IOException"/>
private void Compute(string name, Summation sigma)
{
if (sigma.GetValue() != null)
{
throw new IOException("sigma.getValue() != null, sigma=" + sigma);
}
//setup remote directory
FileSystem fs = FileSystem.Get(GetConf());
Path dir = fs.MakeQualified(new Path(parameters.remoteDir, name));
if (!Org.Apache.Hadoop.Examples.PI.Util.CreateNonexistingDirectory(fs, dir))
{
return;
}
//setup a job
Job job = CreateJob(name, sigma);
Path outdir = new Path(dir, "out");
FileOutputFormat.SetOutputPath(job, outdir);
//start a map/reduce job
string startmessage = "steps/parts = " + sigma.E.GetSteps() + "/" + parameters.nParts
+ " = " + Org.Apache.Hadoop.Examples.PI.Util.Long2string(sigma.E.GetSteps() / parameters
.nParts);
Org.Apache.Hadoop.Examples.PI.Util.RunJob(name, job, parameters.machine, startmessage
, timer);
IList <TaskResult> results = Org.Apache.Hadoop.Examples.PI.Util.ReadJobOutputs(fs,
outdir);
Org.Apache.Hadoop.Examples.PI.Util.WriteResults(name, results, fs, parameters.remoteDir
);
fs.Delete(dir, true);
//combine results
IList <TaskResult> combined = Org.Apache.Hadoop.Examples.PI.Util.Combine(results);
PrintWriter @out = Org.Apache.Hadoop.Examples.PI.Util.CreateWriter(parameters.localDir
, name);
try
{
foreach (TaskResult r in combined)
{
string s = TaskResult2string(name, r);
@out.WriteLine(s);
@out.Flush();
[email protected](s);
}
}
finally
{
@out.Close();
}
if (combined.Count == 1)
{
Summation s = combined[0].GetElement();
if (sigma.Contains(s) && s.Contains(sigma))
{
sigma.SetValue(s.GetValue());
}
}
}
/// <summary>
/// <inheritDoc/>
///
/// </summary>
/// <exception cref="System.Exception"/>
public int Run(string[] args)
{
//parse arguments
if (args.Length != DistSum.Parameters.Count + 2)
{
return(Org.Apache.Hadoop.Examples.PI.Util.PrintUsage(args, GetType().FullName + " <name> <sigma> "
+ DistSum.Parameters.List + "\n <name> The name." + "\n <sigma> The summation."
+ DistSum.Parameters.Description));
}
int i = 0;
string name = args[i++];
Summation sigma = Summation.ValueOf(args[i++]);
SetParameters(DistSum.Parameters.Parse(args, i));
[email protected]();
[email protected]("name = " + name);
[email protected]("sigma = " + sigma);
[email protected](parameters);
[email protected]();
//run jobs
Summation result = Execute(name, sigma);
if (result.Equals(sigma))
{
sigma.SetValue(result.GetValue());
timer.Tick("\n\nDONE\n\nsigma=" + sigma);
return(0);
}
else
{
timer.Tick("\n\nDONE WITH ERROR\n\nresult=" + result);
return(1);
}
}
/// <summary>Write sigma to DataOutput</summary>
/// <exception cref="System.IO.IOException"/>
public static void Write(Summation sigma, DataOutput @out)
{
SummationWritable.ArithmeticProgressionWritable.Write(sigma.N, @out);
SummationWritable.ArithmeticProgressionWritable.Write(sigma.E, @out);
double v = sigma.GetValue();
if (v == null)
{
@out.WriteBoolean(false);
}
else
{
@out.WriteBoolean(true);
@out.WriteDouble(v);
}
}
