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Advances, Systems and Applications

Table 9 Simulation results of scenario three (Highly heterogeneous environment, high remote fetching overhead, and less stable slot processing speeds)

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

RPC = 4.0

Total number of data blocks

VPPT = ± 10%

3000

3500

4500

5500

6500

7500

8500

Number of blocks assigned according to the ECT rule

645.2

1140.3

2138.2

3142.3

4140.6

5136.1

6139.9

MPCT of Hadoop (time units)

256.0

254.7

219.7

195.9

190.5

177.8

169.0

MPCT of ECT (time units)

155.5

147.8

139.5

134.2

129.9

127.4

125.9

ECT reduction in MPCT

39.3%

42.0%

36.5%

31.5%

31.8%

28.3%

25.5%

NBRP under Hadoop

417.9

418.9

536.8

607.6

672.7

758.4

845.8

NBRP under ECT

119.1

151.2

206.7

268.4

340.5

400.7

457.3

ECT reduction in NBRP

71.5%

63.9%

61.5%

55.8%

49.4%

47.2%

45.9%