/// <summary>Choose a Machine in runtime according to the cluster status.</summary>
/// <exception cref="System.IO.IOException"/>
private DistSum.Machine ChooseMachine(Configuration conf)
{
int parts = conf.GetInt(NParts, int.MaxValue);
try
{
for (; ; Sharpen.Thread.Sleep(2000))
{
//get cluster status
ClusterMetrics status = cluster.GetClusterStatus();
int m = status.GetMapSlotCapacity() - status.GetOccupiedMapSlots();
int r = status.GetReduceSlotCapacity() - status.GetOccupiedReduceSlots();
if (m >= parts || r >= parts)
{
//favor ReduceSide machine
DistSum.Machine value = r >= parts ? DistSum.ReduceSide.Instance : DistSum.MapSide
.Instance;
[email protected](" " + this + " is " + value +
" (m=" + m + ", r=" + r + ")");
return(value);
}
}
}
catch (Exception e)
{
throw new IOException(e);
}
}
private Parameters(DistSum.Machine machine, int nThreads, int nJobs, int nParts,
string remoteDir, FilePath localDir)
{
/////////////////////////////////////////////////////////////////////////////
this.machine = machine;
this.nThreads = nThreads;
this.nJobs = nJobs;
this.nParts = nParts;
this.remoteDir = remoteDir;
this.localDir = localDir;
}
/// <summary>Run a job.</summary>
internal static void RunJob(string name, Job job, DistSum.Machine machine, string
startmessage, Util.Timer timer)
{
JobSemaphore.AcquireUninterruptibly();
long starttime = null;
try
{
try
{
starttime = timer.Tick("starting " + name + " ...\n " + startmessage);
//initialize and submit a job
machine.Init(job);
job.Submit();
// Separate jobs
long sleeptime = 1000L * job.GetConfiguration().GetInt(JobSeparationProperty, 10);
if (sleeptime > 0)
{
[email protected](name + "> sleep(" + Org.Apache.Hadoop.Examples.PI.Util
.Millis2String(sleeptime) + ")");
Sharpen.Thread.Sleep(sleeptime);
}
}
finally
{
JobSemaphore.Release();
}
if (!job.WaitForCompletion(false))
{
throw new RuntimeException(name + " failed.");
}
}
catch (Exception e)
{
throw e is RuntimeException ? (RuntimeException)e : new RuntimeException(e);
}
finally
{
if (starttime != null)
{
timer.Tick(name + "> timetaken=" + Org.Apache.Hadoop.Examples.PI.Util.Millis2String
(timer.Tick() - starttime));
}
}
}
