Performance Analysis of Lambda Architecture-Based Big-Data Systems on Air/Ground Surveillance Application with ADS-B Data

. 2023 Aug 31;23(17):7580. doi: 10.3390/s23177580

Algorithm 1 Calculate Performance Metrics $P (T_{w})$ and $R (T_{w})$ in Time Window $T_{w}$
Require: $P r e c o m p u t e d D a t a (T_{w}) \notin ⌀$ , and $T_{w} > 0$
Ensure: $P (T_{w}) \neq 0$ , and $R (T_{w}) \neq 0$
1.	${T_{s}} \leftarrow G e n e r a t e T i m e S t e p s (T_{w})$
2.	for all $T_{s}^{s t e p}$ $\in {T_{s}}$ do
3.	${R e s u l t s e t_{S e r v i n g L a y e r}^{T_{s}^{s t e p}}} \leftarrow$ ExecuteQueryFromServingLayer( $T_{s}^{s t e p}$ )
4.	${R e s u l t s e t_{P r e c o m p u t e d}^{T_{s}^{s t e p}}} \leftarrow$ ExecuteQueryFromPrecomputedData( $T_{s}^{s t e p}$ )
5.	${R e s u l t s e t_{T e m p}^{T_{s}^{s t e p}}} \leftarrow {R e s u l t s e t_{S e r v i n g L a y e r}^{T_{s}^{s t e p}}} ⋈ {R e s u l t s e t_{P r e c o m p u t e d}^{T_{s}^{s t e p}}}$
6.	$P (T_{s}^{s t e p}) \leftarrow$ CalculatePrecision( $T_{s}^{s t e p}$ , ${R e s u l t s e t_{T e m p}^{T_{s}^{s t e p}}}$ )
7.	$R (T_{s}^{s t e p}) \leftarrow$ CalculateRecall( $T_{s}^{s t e p}$ , ${R e s u l t s e t_{T e m p}^{T_{s}^{s t e p}}}$ )
8.	end for
9.	${T_{w}} \leftarrow ⋃_{T_{s} = 0}^{T_{w}} T_{s}$
10.	${P (T_{w})} \leftarrow ⋃_{T_{s} = 0}^{T_{w}} P (T_{s})$
11.	${R (T_{w})} \leftarrow ⋃_{T_{s} = 0}^{T_{w}} R (T_{s})$
12.	return { $T_{w}$ }, { $P (T_{w})$ }, { $R (T_{w})$ }