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Advances, Systems and Applications

Table 8 Simulation results of scenario two (Highly heterogeneous environment, medium remote fetching overhead, and relatively stable slot processing speeds)

From: An improved task assignment scheme for Hadoop running in the clouds

RPC = 2.5

Total number of data blocks

VPPT = ± 5%

3000

3500

4500

5500

6500

7500

8500

Number of blocks assigned according to the ECT rule

700.1

1199.5

2198.2

3200.3

4196.4

5200.1

6195.4

MPCT of Hadoop (time units)

185.4

187.8

163.5

151.8

149.9

141.8

135.9

MPCT of ECT (time units)

138.9

130.7

125.1

121.4

117.4

116.0

114.9

ECT reduction in MPCT

25.1%

30.4%

23.5%

20.0%

21.7%

18.2%

15.5%

NBRP under Hadoop

423.6

427.7

571.7

665.9

742.7

878.7

984.0

NBRP under ECT

241.2

273.3

378.4

455.3

527.5

625.1

699.8

ECT reduction in NBRP

43.1%

36.1%

33.8%

31.6%

29.0%

28.9%

28.9%