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S3 file reading error

Hi,
Kindly I would like to ask you to help me solve a problem with a file reading form AWS S3 bucket. I use a very basic connection:

import pyspark
sc = pyspark.SparkContext.getOrCreate()
data = sc.textFile('s3://my_bucket/s3inputfile.dat')
data.count()

Then I'm receiving the error:

Py4JJavaError: An error occurred while calling z:org.apache.spark.api.python.PythonRDD.collectAndServe.
: java.lang.IllegalArgumentException: java.net.UnknownHostException: hadoop-namenode

Thanks in advice solving the error.
Best regards,
Tom

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