public static String createBrokerIdString(JobID jid, String iterationID, int subtaskIndex) {
		return jid + "-" + iterationID + "-" + subtaskIndex;
	}
public static String createBrokerIdString ( JobID jid , String iterationID , int subtaskIndex ) { return jid + "-" + iterationID + "-" + subtaskIndex ; }
Creates the identification string with which head and tail task find the shared blocking
queue for the back channel. The identification string is unique per parallel head/tail pair
per iteration per job.

@param jid The job ID.
@param iterationID The id of the iteration in the job.
@param subtaskIndex The parallel subtask number
@return The identification string.