Shulou(Shulou.com)05/31 Report--

This article shows you how to manipulate spark files and debug in Spark API programming. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

This time we start spark-shell by specifying the executor-memory parameter:

Read the file from the hdfs:

You can see that MappedRDD is converted from HadoopRDD.

Take another look at the source code of textFile:

Let's do a simple wordcount operation:

Using toDebugString again, look at the dependencies:

HadoopRDD-> MappedRDD-> FlatMappedRDD-> MappedRDD-> ShuffledRDD

The above is what spark file manipulation and debug are like in Spark API programming. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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