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This article is about Spark API programming how to achieve in Spark 1.2 version of union, groupByKe analysis, editor feels very practical, so share with you to learn, I hope you can get something after reading this article, say no more, follow the editor to have a look.

Here's a look at the use of union:

Use the collect operation to view the execution result:

Take a look at the use of groupByKey:

The join operation is a Cartesian product operation, as shown in the following example:

Use collect to view the execution result:

You can see that the join operation is completely an operation of Cartesian product.

Reduce itself belongs to an operation of type action in the RDD operation, which results in the submission and execution of the job:

Let's take a look at the use of lookup:

The above is how to achieve the analysis of union and groupByKe in Spark 1.2 in Spark API programming. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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