Practical Real-time Data Processing and Analytics

Actions

In a nutshell, it can be said that actions actually execute the transformations on real data to generate the output. Actions send the data from the executor to the driver. Following is capture of actions that return values (from: https://spark.apache.org/docs/latest/rdd-programming-guide.html#actions):

Let us look at some code snippets to see actions executing actually in action:

• count(): As the name suggests, this operation counts and gives you the number of elements in an RDD. We used the count action in the preceding filter example where we counted the number of words in each line of the file being read.
• collect(): The collect ...