Table 4 Simulation results of scenario two (Slightly 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% | 2500 | 3000 | 4000 | 5000 | 6000 | 7000 | 8000 |
| Number of blocks assigned according to the ECT rule | 500 | 1000 | 2000 | 3000 | 4000 | 5000 | 6000 |
| MPCT of Hadoop (time units) | 185.4 | 182.6 | 160.7 | 146.8 | 138.2 | 132.2 | 130.0 |
| MPCT of ECT (time units) | 146.8 | 145.7 | 132.9 | 123.8 | 120.0 | 117.6 | 116.0 |
| ECT reduction in MPCT | 20.8% | 20.2% | 17.3% | 15.6% | 13.2% | 11.1% | 10.8% |
| NBRP under Hadoop | 285.2 | 89.6 | 214.1 | 306.9 | 365.5 | 411.2 | 443.1 |
| NBRP under ECT | 0.9 | 15.0 | 23.6 | 36.4 | 85.0 | 135.6 | 176.6 |
| ECT reduction in NBRP | 99.7% | 83.3% | 89.0% | 88.1% | 76.7% | 67.0% | 60.1% |
