Add a Configuration to Change the Number of Reduce Tasks of the Analyze Process #593
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A single reducer is used to aggregate the data and generate the extended metrics. By using multiple reducer, I don't think we'll get the expected analysis result. |
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When running the DFSIO test, I found that the analysis part of the procedure took a very long time, even much longer than the test itself. It is set to own only one reduce task, which is not reasonable. After adding this config, the number of reduce task of the analysis part becomes configurable. I run a test on an 8-core server and the analysis part took only 1/8 time than before.
I wonder if the community can consider to merge this change. I only changed the code for the DFSIO test, but there are same problems for other test cases. If these changes looks feasible, I'm glad to try changing other test cases.