i'm buildind a pyspark app using jupyter notebook , so far i'm using it in a standalone mode.
Now i have in my disposition 3 Virtual machines with spark on them, and i want to start Pyspark in a cluster.
Here is my code to start it in standalone mode :
knowing i'm using spark 3.1.2 hadoop 3.2
i've searched for ways to do it and i didn't get it, and there are some articles saying that pyspark doesn't work in clusters, so please if you know how i can change this code and launch my session in a cluster please help.
thank you.
You most have a cluster of some sort.
I use kubernutes and https://github.com/bjornjorgensen/jlpyk8s
This way I have a notebook that interactive run pyspark on.
Related
I've created a spark cluster on EMR.
But I'm unable to access pyspark when I open it with a notebook.
Configuration:
Example:
from pyspark import SparkContext
I also cannot access sc which I was under the impression would be available.
sc.list_packages()
NameError: name 'sc' is not defined
I feel like I'm missing something very basic here but I'm completely new to EMR and have spent a bunch of time on this already.
Are there any ideas I should try to debug this?
When I opened my notebook with "JupyterLab" instead of "Jupyter" all libraries were available.
I'm looking for a way to easily execute parametrized run of Jupyter Notebooks, and I've found Papermill Project (https://github.com/nteract/papermill/)
This tool seems to match my requirements, but I can't find any reference for PySpark kernel support.
Is PySpark kernels supported by papermill executions?
If it is, there is some configuration to be done to connect it to the Spark cluster used by Jupyter?
Thanks in advance for the support, Mattia
Papermill will work with PySpark kernels, so long as they implement Jupyter's kernel spec.
Configuring your kernel will depend on the kernel in question. Usually these read from spark.conf and/or spark.properties files to configure cluster and launch-time settings for Spark.
I gather from the documentation that we can use Jupyter notebooks only with Databricks Spark cluster.
Is there a way around this? Can I call Jupyter notebook as an activity from ADF without Databricks environment? I would like to have a simple way to call some python code from ADF.
Thanks!
You can try Custom Activity in ADF. Custom activity supports cmd command, so you can use command line to invoke python script.
And there's another example of using python in custom activity:
https://github.com/rawatsudhir1/ADFPythonCustomActivity
Hope it helps.
I'm new to Spark.I installed a Spark 2.3.0 in Stand-Alone-Mode on an Ubuntu 16.04.3 server. That runs well so far. Now I would like to start developing with pyspark because I've got more experience using python than scala.
Ok. Even after using google for a while I'm not sure how I should setup my development environment. My local machine is a windows 10 laptop with eclipse neon and pydev configured. What are the neccessary steps to set ist up that I can develop in a local context and submit my modules to the spark cluster on my server?
Thank for helping.
use spark-submit to run locally or on a cluster. There are many online tutorials for this. I like the AWS documentation which explains the architecture, has sample spark code, and gives examples of local and remote commands. Even if you are not using AWS EMR the basics are the same.
give it a try and let us know how it goes
I just wanted to educate myself more on Spark. So wanted to ask this question.
I have Spark currently installed on my local machine. Its a Mach with 16GB.
I have connected a Jupyter notebook running with Pyspark.
So now when I do any coding in that notebook, like reading the data and converting the data into Spark DataFrame, I wanted to check:
1). Where all the dataset is distributed on local machine. Like does it distribute the dataset using different cores of CPU etc?. Is there a way to find that out?
2). Running the code and computation just using Jupyter notebook without spark is different from running Jupyter notebook with Pyspark? Like the first one just uses one core of the machine and runs using one thread while Jupyter notebook with Pyspark runs the code and computing on different cores of CPU with multi-threading/processing? Is this understanding correct?.
Is there a way to check these.
Thanks
Jupyter has mainly three parts Jupyter Notebook, Jupyter Clients and Kernels. http://jupyter.readthedocs.io/en/latest/architecture/how_jupyter_ipython_work.html
Here is short note on Kernel from Jupyter homepage.
Kernels are processes that run interactive code in a particular
programming language and return output to the user. Kernels also
respond to tab completion and introspection requests.
Jupyter's job is to communicate between the Kernel(Like python kernel, spark kernel ..) and web interface(your notebook). So under the hood spark is running drivers and executors for you, Jupyter helps in communicating with the spark driver.
1). Where all the dataset is distributed on local machine. Like does
it distribute the dataset using different cores of CPU etc?. Is there
a way to find that out?
Spark will spawn n number of executors(process responsible for executing a task) as specified using --num-executors, executors are managed by a spark driver(program/process responsible for running the Job over the Spark Engine). So the number of executors are specified while you run a spark program, you will find this kernel conf directory.
2). Running the code and computation just using Jupyter notebook
without spark is different from running Jupyter notebook with Pyspark?
Like the first one just uses one core of the machine and runs using
one thread while Jupyter notebook with Pyspark runs the code and
computing on different cores of CPU with multi-threading/processing?
Is this understanding correct?.
Yes, as I explained Jupyter is merely an interface letting you run code. Under the hood, Jupyter connects to Kernels be it normal Python or Apache Spark.
Spark has it's own good UI to monitor jobs, by default it runs on spark master server on port 4040. In your case, it will available on http://localhost:4040