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The experiments were carried out by having a percentage of resources failing, i.e., stopping to execute, at random time during the job execution.
The job execution scenario is based on a test case executing a parameter study with 1000 input files against a 500 GB database.
In this situation, having more than 20 executing nodes available will not speed up overall job execution any more than having just 20.
The middleware introduces an overhead on each job execution.
The hardware/software failures also increase job execution time.
Fig. 1 The job execution workflow of MapReduce framework.
job execution time × (num. of waiting jobs +1).
The JobTracker assumes the responsibility and coordinates the job execution.
Average job execution time can be calculated as shown in expression (1) where W new stands for current average job execution time and W old is previous value, W last is last job execution time.
Wireless devices are considered as important resources for job execution in a wireless grid.
This environment provides finer control of the parallel job execution, including the capability of job cancellation.
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