py4j Questions
2
I installed Spark and I am running into problems loading the pyspark module into ipython. I'm getting the following error:
ModuleNotFoundError Traceback (most recent call last)
<ipython-in...
Discolor asked 28/5, 2019 at 12:47
7
Solved
Is it possible to execute arbitrary SQL commands like ALTER TABLE from AWS Glue python job? I know I can use it to read data from tables but is there a way to execute other database specific comman...
4
Once logging is started in INFO level I keep getting bunch of py4j.java_gateway:Received command c on object id p0 on your logs. How can I hide it?
2
I am trying to convert a spark RDD to Pandas DataFrame.
I'm using a csv file as an example. The file has 10 Here are the first 3 rows:
"Eldon Base for stackable storage shelf, platinum",Muhammed ...
Antisana asked 23/4, 2020 at 11:18
2
Solved
I want to create a Jupyter/IPython extension to monitor Apache Spark Jobs.
Spark provides a REST API.
However instead of polling the server, I want the event updates to be sent through callbacks.
I...
Golightly asked 20/5, 2017 at 7:5
5
After searching for an option to run Java code from Django application(python), I found out that Py4J is the best option for me. I tried Jython, JPype and Python subprocess and each of them have ce...
1
I am trying to access the org.apache.hadoop.fs.FileUtil.unTar directly from a pyspark shell.
I understand that I can access the underlying virtual machine (via py4j) sc._jvm to do this, but am st...
Cyan asked 25/4, 2016 at 12:6
10
Solved
I installed apache-spark and pyspark on my machine (Ubuntu), and in Pycharm, I also updated the environment variables (e.g. spark_home, pyspark_python).
I'm trying to do:
import os, sys
os.environ...
Tot asked 27/4, 2018 at 14:32
5
Hello I was working with Pyspark, implementing a sentiment analysis project using ML package for the first time. The code was working good but suddenly it becomes showing the error mentioned above:...
Boucicault asked 16/7, 2018 at 10:33
4
I'm trying to run a custom HDFS reader class in PySpark. This class is written in Java and I need to access it from PySpark, either from the shell or with spark-submit.
In PySpark, I retrieve the ...
Shoreline asked 5/11, 2015 at 12:6
6
I installed Spark, ran the sbt assembly, and can open bin/pyspark with no problem. However, I am running into problems loading the pyspark module into ipython. I'm getting the following error:
In ...
Lipscomb asked 23/10, 2014 at 16:46
2
I'm unable to run below import in Jupyter notebook.
findspark.init('home/ubuntu/spark-3.0.0-bin-hadoop3.2')
Getting this following error:
---------------------------------------------------------...
7
I'm trying to make pyjnius work with a jar file I built from java application, but I keep getting the "Class not found" error:
>>> import os
>>> os.environ['CLASSPATH'] = "~/work...
4
Solved
When running the following in a Python 3.5 Jupyter environment I get the error below. Any ideas on what is causing it?
import findspark
findspark.init()
Error:
IndexError Traceback (most recent...
Triazine asked 14/2, 2017 at 10:20
2
I am new to PySpark. I have been writing my code with a test sample. Once I run the code on the larger file(3gb compressed). My code is only doing some filtering and joins. I keep getting errors re...
Kerch asked 6/2, 2019 at 4:13
9
Solved
I have some third-party database client libraries in Java. I want to access them through
java_gateway.py
E.g.: to make the client class (not a JDBC driver!) available to the Python client via the ...
Harmonics asked 30/12, 2014 at 0:43
2
Solved
I need to create a UDF to be used in pyspark python which uses a java object for its internal calculations.
If it were a simple python I would do something like:
def f(x):
return 7
fudf = pyspa...
Shred asked 23/3, 2016 at 6:28
1
Several people (1, 2, 3) have discussed using a Scala UDF in a PySpark application, usually for performance reasons. I am interested in the opposite - using a python UDF in a Scala Spark project.
...
Periostitis asked 18/8, 2018 at 16:30
4
I'm new to Spark and I'm using Pyspark 2.3.1 to read in a csv file into a dataframe. I'm able to read in the file and print values in a Jupyter notebook running within an anaconda environment. This...
0
This exception is rising at lines.count().
Exception has occurred: py4j.protocol.Py4JError An error occurred
while calling o26.isBarrier. Trace: py4j.Py4JException: Method
isBarrier([]) ...
Chace asked 30/1, 2019 at 9:27
2
Solved
This is the snippet:
from pyspark import SparkContext
from pyspark.sql.session import SparkSession
sc = SparkContext()
spark = SparkSession(sc)
d = spark.read.format("csv").option("header", True)...
Immesh asked 24/11, 2018 at 5:38
3
Solved
This question is directed towards persons familiar with py4j - and can help to resolve a pickling error. I am trying to add a method to the pyspark PythonMLLibAPI that accepts an RDD of a namedtupl...
Kovno asked 28/4, 2015 at 5:4
2
Solved
I am able to interact with my sample Java program in Python, by opening my Java program and then using the following Python code:
from py4j.java_gateway import JavaGateway
gg = JavaGateway()
sw = ...
1
Solved
I am trying to pass varargs to Java code from python.
Java code :
LogDebugCmd.java
public class LogDebugCmd implements Command {
private Class clazz;
private String format;
private Object[] a...
Lauryn asked 3/11, 2016 at 22:45
3
Solved
I want to call java from python with Py4J library,
from py4j.java_gateway import JavaGateway
gateway = JavaGateway() # connect to the JVM
gateway.jvm.java.lang.System.out.println('Hello World!')
...
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