# A Unified Vendor-Agnostic Solution for Big Data Stream Processing in a Multi-Cloud Environment
## 4 MC-BDP Prototype Evaluation
### Experimental Results
#### 4.1.5 Container Network Utilisation (GB Sent by Workers)  
Based on the summary results presented in Table 7 for total number of GB sent over the network, the following conclusions were drawn: (i) total number of GB sent over the network by velocity for scalability--means of three or six workers (single and multiple) are not significantly different from each other. The same conclusion was drawn for all the possible combinations of three workers (single and multiple) x six workers (single and multiple); (ii) total number of GB sent over the network by velocity for fault tolerance--the same conclusions for all combinations in (i); (iii) total number of GB sent over the network by velocity for technology agnosticism--all means for three or six workers (Beam, Flink) x (single, multiple) are not significantly different from each other. The same conclusion is drawn for three workers [(Beam, Flink) x (single, multiple)] and six workers [(Beam, Flink) x (single, multiple)]. The means of number of workers (three, six, ten) as well as the number of containers per node (one, two, four) were also not significantly different from each other for the total number of GB sent over the network by windowing rate. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{1}{c}{} & \multicolumn{5}{c}{Scalability Metrics} \\ \hline Velocity & Three Workers (n = 3) & Six Workers (n = 6) & Mann–Whitney U Test Results \\ \hline  & Single & Multi & Single & Multi & Three Workers and Three Workers (Single and Multi) \\ \hline
1 min & 0.04 & 0.03 & 0.06 & 0.05 & _p_-value = 0.7702, accept [PERSON] \\ \hline
1 sec & 0.06 & 0.04 & 0.09 & 0.06 &
\begin{tabular}{c} Three Workers and Six \\ Workers ([_S_,_S_] x [M,M]) \\ \end{tabular} \\ \hline
100 ms & 0.06 & 0.10 & 0.12 & 0.10 & _p_-value = 0.3832, accept Ho (S,M) \\  & & & & _p_-value = 0.5556, accept Ho (M,S) \\ \hline
10 ms & 0.48 & 0.47 & 0.21 & 0.49 & _p_-value = 0.3532, accept Ho (M,M) \\ \hline Total Number of GB Sent over the Network by Velocity & 1 ms & NA & NA & 0.36 & 3.30 & Six Workers and Six Workers (Single and Multi) \\ \hline  & & & & & & \\ \hline  & & & & & & \\ \end{tabular}
\begin{tabular}{c c c c c} \hline \hline Velocity & Three Workers (n = 3) & Six Workers (n = 6) & Mann–Whitney U Test Results \\ \hline  & Single & Multi & Single & Multi & Three Workers and Three Workers (Single and Multi) \\ \hline
1 min & 0.84 & 0.34 & 4.50 & 0.80 & _p_-value = 0.8845, accept Ho \\ \hline
1 sec & 0.76 & 1.44 & 2.62 & 0.95 &
\begin{tabular}{c} Three Workers and Six Workers \\ ([_S_,_S_] x [M,M]) \\ \end{tabular} \\ \hline
100 ms & 0.84 & 0.52 & 1.48 & 1.10 & _p_-value = 0.0294, accept Ho (S,S) \\  & & & & & _p_-value = 0.1102, accept Ho (S,M) \\  & & & & & _p_-value = 0.02857, accept Ho (M,S) \\ \hline
10 ms & 0.33 & 0.63 & 1.70 & 1.88 & _p_-value = 0.2000, accept Ho (M,M) \\ \hline
1 ms & NA & NA & NA & NA & Six Workers and Six Workers (Single and Multi) \\ \hline Average & 0.69 & 0.73 & 2.58 & 1.18 & _p_-value = 0.1143, accept Ho \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Network utilisation—total number of gigabytes sent over the network.