python spark教程菜鸟教程_菜鸟教程hadoop-hadoop入门教程

菜鸟教程hadoop-hadoop入门教程

菜鸟教程hadoop-本站旨在为从事大数据行业或学习hadoop技术人员提供一个交流学习平台,全面收集了在大数据时代的互联网巨头企业的hadoop入门教程精华技术文章

Lastly, we varied the number of nodes between 10 and 200 with step size 10. Meanwhile, the number of tasks was changed accordingly to make it equal the number of idle slots so that all idle slots would be utilized (note the ratio of idle slots is fixed). The result is shown in Fig. 4(c). We observe that the improvement oscillates. We conjecture that it is caused by the fact that our simulation only covers a portion of all possible data placements and idle slot distributions. When there are 100 nodes and 50 tasks, the input data of each task can be placed onto any of the 100 nodes and the number of all possible placements is 10050. That number does not even take into consideration how idle slots are distributed across all slots. So it is impossible to enumerate all possible cases and calculate result for each.

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