/// <summary>The method sends metrics to Ganglia servers.</summary>
/// <remarks>
/// The method sends metrics to Ganglia servers. The method has been taken from
/// org.apache.hadoop.metrics.ganglia.GangliaContext30 with minimal changes in
/// order to keep it in sync.
/// </remarks>
/// <param name="groupName">The group name of the metric</param>
/// <param name="name">The metric name</param>
/// <param name="type">The type of the metric</param>
/// <param name="value">The value of the metric</param>
/// <param name="gConf">The GangliaConf for this metric</param>
/// <param name="gSlope">The slope for this metric</param>
/// <exception cref="System.IO.IOException"/>
protected internal virtual void EmitMetric(string groupName, string name, string
type, string value, GangliaConf gConf, AbstractGangliaSink.GangliaSlope gSlope)
{
if (name == null)
{
Log.Warn("Metric was emitted with no name.");
return;
}
else
{
if (value == null)
{
Log.Warn("Metric name " + name + " was emitted with a null value.");
return;
}
else
{
if (type == null)
{
Log.Warn("Metric name " + name + ", value " + value + " has no type.");
return;
}
}
}
if (Log.IsDebugEnabled())
{
Log.Debug("Emitting metric " + name + ", type " + type + ", value " + value + ", slope "
+ gSlope.ToString() + " from hostname " + GetHostName());
}
Xdr_int(0);
// metric_user_defined
Xdr_string(type);
Xdr_string(name);
Xdr_string(value);
Xdr_string(gConf.GetUnits());
Xdr_int((int)(gSlope));
Xdr_int(gConf.GetTmax());
Xdr_int(gConf.GetDmax());
// send the metric to Ganglia hosts
EmitToGangliaHosts();
}
/// <summary>The method sends metrics to Ganglia servers.</summary>
/// <remarks>
/// The method sends metrics to Ganglia servers. The method has been taken from
/// org.apache.hadoop.metrics.ganglia.GangliaContext31 with minimal changes in
/// order to keep it in sync.
/// </remarks>
/// <param name="groupName">The group name of the metric</param>
/// <param name="name">The metric name</param>
/// <param name="type">The type of the metric</param>
/// <param name="value">The value of the metric</param>
/// <param name="gConf">The GangliaConf for this metric</param>
/// <param name="gSlope">The slope for this metric</param>
/// <exception cref="System.IO.IOException"/>
protected internal override void EmitMetric(string groupName, string name, string
type, string value, GangliaConf gConf, AbstractGangliaSink.GangliaSlope gSlope)
{
if (name == null)
{
Log.Warn("Metric was emitted with no name.");
return;
}
else
{
if (value == null)
{
Log.Warn("Metric name " + name + " was emitted with a null value.");
return;
}
else
{
if (type == null)
{
Log.Warn("Metric name " + name + ", value " + value + " has no type.");
return;
}
}
}
if (Log.IsDebugEnabled())
{
Log.Debug("Emitting metric " + name + ", type " + type + ", value " + value + ", slope "
+ gSlope.ToString() + " from hostname " + GetHostName());
}
// The following XDR recipe was done through a careful reading of
// gm_protocol.x in Ganglia 3.1 and carefully examining the output of
// the gmetric utility with strace.
// First we send out a metadata message
Xdr_int(128);
// metric_id = metadata_msg
Xdr_string(GetHostName());
// hostname
Xdr_string(name);
// metric name
Xdr_int(0);
// spoof = False
Xdr_string(type);
// metric type
Xdr_string(name);
// metric name
Xdr_string(gConf.GetUnits());
// units
Xdr_int((int)(gSlope));
// slope
Xdr_int(gConf.GetTmax());
// tmax, the maximum time between metrics
Xdr_int(gConf.GetDmax());
// dmax, the maximum data value
Xdr_int(1);
/*Num of the entries in extra_value field for
* Ganglia 3.1.x*/
Xdr_string("GROUP");
/*Group attribute*/
Xdr_string(groupName);
/*Group value*/
// send the metric to Ganglia hosts
EmitToGangliaHosts();
// Now we send out a message with the actual value.
// Technically, we only need to send out the metadata message once for
// each metric, but I don't want to have to record which metrics we did and
// did not send.
Xdr_int(133);
// we are sending a string value
Xdr_string(GetHostName());
// hostName
Xdr_string(name);
// metric name
Xdr_int(0);
// spoof = False
Xdr_string("%s");
// format field
Xdr_string(value);
// metric value
// send the metric to Ganglia hosts
EmitToGangliaHosts();
}