Iterate through list of jobs and run multithreads.
Recently, I found a set of code that iterate through list of configs and start the job by using execution pool, and the way and style it use very different as I used to write, so I went through and write down this blog try to see what is the advantage of this sytle.
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Use Spark as ETL tools
Spark could be used as ETL tools, today we are going to walk you throught how to and explain the required Spark knowledge.
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