spark textfile

Spark textfile is a function in Apache Spark that reads a text file from Hadoop Distributed File System (HDFS) or a local file system and returns an RDD (Resilient Distributed Dataset) of string type. The textfile function is used to load large amounts of unstructured data, such as log files or user-generated content, into Spark for analysis.

The syntax for reading a text file using the textfile function is:

val rdd = sc.textFile("path/to/file")

Here, `sc` is a SparkContext object, and `path/to/file` is the location of the text file that needs to be read. The textfile function reads the file line by line and returns an RDD of strings, where each string represents a line in the file.

The textfile function supports reading multiple text files at once by specifying a comma-separated list of file paths, as shown below:

val rdd = sc.textFile("path/to/file1, path/to/file2")

In this case, the textfile function reads both `file1` and `file2` and returns a combined RDD of strings.