@Override
    public String toString() {
        return "Span{" +
                "timeRecording=" + timeRecording +
                ", traceRoot=" + traceRoot +
                ", startTime=" + startTime +
                ", elapsed=" + elapsedTime +
                ", serviceType=" + serviceType +
                ", remoteAddr='" + remoteAddr + '\'' +
                ", annotations=" + annotations +
                ", spanEventList=" + spanEventList +
                ", parentApplicationName='" + parentApplicationName + '\'' +
                ", parentApplicationType=" + parentApplicationType +
                ", acceptorHost='" + acceptorHost + '\'' +
                ", apiId=" + apiId +
                ", exceptionInfo=" + exceptionInfo +
                "} " + super.toString();
    }
Span represent RPC

@author netspider
@author emeroad
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/context/Span.java