python - PySpark: "Exception: Java gateway process exited before ...
I'm trying to run PySpark on my MacBook Air. When I try starting it up, I get the error: Exception: Java gateway process exited before sending the driver its port number when sc = …
python - Spark Equivalent of IF Then ELSE - Stack Overflow
python apache-spark pyspark apache-spark-sql edited Dec 10, 2017 at 1:43 Community Bot 1 1
pyspark - How to use AND or OR condition in when in Spark
107 pyspark.sql.functions.when takes a Boolean Column as its condition. When using PySpark, it's often useful to think "Column Expression" when you read "Column". Logical operations on …
pyspark : NameError: name 'spark' is not defined
Alternatively, you can use the pyspark shell where spark (the Spark session) as well as sc (the Spark context) are predefined (see also NameError: name 'spark' is not defined, how to solve?).
python - Concatenate two PySpark dataframes - Stack Overflow
Utilize simple unionByName method in pyspark, which concats 2 dataframes along axis 0 as done by pandas concat method. Now suppose you have df1 with columns id, uniform, normal and …
Pyspark: get list of files/directories on HDFS path
Mar 2, 2016 · As per title. I'm aware of textFile but, as the name suggests, it works only on text files. I would need to access files/directories inside a path on either HDFS or a local path. I'm …
Comparison operator in PySpark (not equal/ !=) - Stack Overflow
Aug 24, 2016 · Comparison operator in PySpark (not equal/ !=) Asked 9 years, 2 months ago Modified 1 year, 8 months ago Viewed 164k times
How do I replace a string value with a NULL in PySpark?
Mar 7, 2023 · I want to do something like this: df.replace('empty-value', None, 'NAME') Basically, I want to replace some value with NULL, but it does not accept None as an argument. How can …
Pyspark: Replacing value in a column by searching a dictionary
May 15, 2017 · @AliAzG is there a way to Remove those rows from a pyspark dataframe whose entries from a column [of the pyspark] are not present in a dictionary's list of keys?
Pyspark: Parse a column of json strings - Stack Overflow
I have a pyspark dataframe consisting of one column, called json, where each row is a unicode string of json. I'd like to parse each row and return a new dataframe where each row is the …