Multiple Inputs with MRJob

I'm trying to learn to use Yelp's Python API for MapReduce, MRJob. Their simple word counter example makes sense, but I'm curious how one would handle an application involving multiple inputs. For...

About hadoop mrjob cannot mkdir

I'm trying to run a mapreduce job.I set the output path as: /local/mypath/mr_reuslt But get: SEVERE: Mkdirs failed to create: /local/mypath/mr_reuslt/_temporary But I'm sure from my account I...

hadoop with mrjob piping on shell

I have an issue regarding mrjob. I'm using an hadoopcluster over 3 datanodes using one namenode and one jobtracker. Starting with a nifty sample application I wrote something like the...

MapReduce with Recursion

Consider the following problem: EDIT: Ignore if the algorithm below doesn't make much sense. I just put it there for the sake of it. The idea is that doFunc is somehow recursive. doFunc(A): ...

mrjob: setup logging on EMR

I'm trying to use mrjob for running hadoop on EMR, and can't figure out how to setup logging (user generated logs in map/reduce steps) so I will be able to access them after the cluster is...

Getting error while running django_cron

When am trying to run the chron job in django using below command python manage.py runcrons its showing one error like below $ python manage.py runcrons No handlers could be found for logger...

Is is possible to use a Conda environment as "virtualenv" for a Hadoop Streaming Job (in Python)?

We are currently using Luigi, MRJob and other frameworks to run Hadoo streaming jobs using Python. We are already able to ship the jobs with its own virtualenv so no specific Python dependencies...

MapReduce job to yield top 10 values using Python's MRjob

I want this map reduce job (code below) to output the top 10 most rated products. It keeps giving me the following error message: it = izip(iterable, count(0,-1)) #...

Running MapReduce from Jupyter Notebook

I am trying to run MapReduce from Jupyter Notebook on a dataset in u.data file, but I keep receiving an error message that says "TypeError: 'str' object doesn't support item deletion". How can I...

MRJob Sort in Python

I have an assignment that requires me to use mapper/reducer in python to complete a MapReduce for customer data. I have a CSV file with the CustomerID, ProductID, and the Amount Spent. The first...

Accessing stream output from hdfs of MRjob

I'm trying to use a Python driver to run an iterative MRjob program. The exit criteria depend on a counter. The job itself seems to run. If I run a single iteration from the command line, I can...

Meaning of re.compile(r"[\w']+") in Python

I am new to python and trying to work on big data code but not able to understand what the expression re.compile(r"[\w']+") means.Anyone has any idea regarding this? This is the code that i m...

MRJob save output in a file

Using MRJob library, the output of reducer is printed in the console and stdout is the default output. How can I specify a file for output so instead of being printed, results will be written in...

python find max value by mrjob

i would like to find the max value in list by mrjob. when i run this, it always show the error: No configs found; falling back on auto-configuration; No configs specified for inline runner i'd...

I'm trying to write a python script to read a csv using Mapreducer and im getting the error ValueError: too many values to unpack (expected 2)

0 I'm running the following Python code in MapReduce: from mrjob.job import MRJob from mrjob.step import MRStep class productRevenue(MRJob): #each input lines consists of product,...

Problem when using SORT_VALUES in a MapReduce job using mrjob (key-values are not sorted in the reducer input)

I want to create a MapReduce program whose reduce receives k-v pairs sorted by the value. I'm using mrjob, whose SORT_VALUES parameter seemed to be ideal for the task. After setting this parameter...

Edit enviroment variables inside python for script bash

my project, which uses mapreduce without hadoop, is composed of two files: bash.sh and mapreduce.py. I would like to use environment variables to communicate the information between bash.sh and...

getting error while running mrjob python scripting in hadoop cluster

hi i want to sort movie ratings by a python script but i am getting error `[[email protected] maria_dev]# python RatingsBreakdown.py -r hadoop --hadoop-streaming-jar...

How do I put a print statement in mrjob code for debugging purposes?

How do I put a debug statement (like print) in reducer or mapper for mrjob. If I try to use print or sys.stderr.write(), I get an error TypeError: a bytes-like object is required, not 'str'

Python dictionary weird behavior in mrjob

I'm writing a code that reads two input files and calculates some statistics like average rating by country. I'm using mrjob library, because the idea is that I'm able to run this on hadoop. Below...

How do I use the map reduce function in Python to determine a value?

Below is a list of data on foods you might find at a grocery store. The CSV file below denote the city, food type, average price per pound, and the meal in which that food is consumed in for a...

Use Pandas dataframe in mrJob

I have a python code and i need to use mrjob to make my python script more faster. How do I make below script to use mrJob? the below script works fine for small file, but when i run large file it...

Need to count the number of documents in a particular directory using python - MapReduce

Please find the below program that I'm using. It is compiling but not giving any output. Request to help with error. import gzip import warc import os from mrjob.job import MRJob class...

Python MapReduce How do i add a conditional statement

I am new to MapReduce and I am trying to find the average movie review for films in the MovieLens 100k dataset. I have a working program that finds the average review for each movie, but what I...

Force schema using spark write

I have an encrypted data in avro format which has the following schema {"type":"record","name":"ProtectionWrapper","namespace":"com.security","fields":...

error while executing MRJob on hadoop using windows command

I am trying to execute MRJob on hadoop cluster using windows command. It is working when I write : Python C:\Users\salha\Documents\Thesis\Implementation\Jacobi_2classes.py...

EMR and MRJOB: TERMINATED_WITH_ERRORS: The given SSH key name was invalid

I'm having trouble running an example mrjob (https://github.com/Yelp/mrjob) with EMR on AWS. Generate the following error: Using configs in /home/ciceromoura/.mrjob.conf Creating temp directory...

Unexpected arguments error appearing on the command line when running mapreduce job (MRjob) using python

I am fairly new to this process. I am trying to run a simple map-reduce job using python 3.8 with a csv on a local Hadoop cluster (Hadoop version 3.2.1). I am currently running it on Windows 10...

MRJob: I'm having a client error while using EMR

I'm a newbie in mrjob and EMR and I'm still trying to figure out how things work. So I'm having this error when I'm running my script: python3 MovieSimilarities.py -r emr --items=ml-100k/u.item...

MapReduce in python to calculate average characters

I am new to map-reduce and coding, I am trying to write a code in python that would calculate the average number of characters and "#" in a tweet Sample data: 1469453965000;757570956625870854;RT...