topic Re: [pyspark] foreach + print produces no output in Data Engineering

[pyspark] foreach + print produces no output

JulioManuelNava — Sat, 02 Nov 2019 07:40:15 GMT

The following code produces no output. It seems as if the print(x) is not being executed for each "words" element:

words = sc.parallelize (
   ["scala", 
   "java", 
   "hadoop", 
   "spark", 
   "akka",
   "spark vs hadoop", 
   "pyspark",
   "pyspark and spark"]
)
def f(x): print(x)
fore = words.foreach(f)

Any idea?

Thanks in advance

Re: [pyspark] foreach + print produces no output

DiegoAlves — Mon, 04 Nov 2019 20:59:46 GMT

The

RDD.foreach

method in Spark runs on the cluster so each worker which contains these records is running the operations in

foreach

. I.e. your code is running, but they are printing out on the Spark workers stdout, not in the driver/your shell session.

There is an easy alternative to print out the desired output:

for w in words.toLocalIterator():
    print(w)

Re: [pyspark] foreach + print produces no output

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