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Questions tagged [mrjob]

Mrjob is a Python 2.5+ package that assists the creation and running of Hadoop Streaming jobs

Mrjob is a Python 2.5+ package that assists the creation and running of Streaming jobs

Mrjob fully supports Amazon’s Elastic MapReduce () service, which allows one to buy time on a Hadoop cluster on an hourly basis. It also works with personal Hadoop clusters.

Mrjob can be installed with :

pip install mrjob
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python mrjob: ignore unrecognized arguments

Normally, if I want to define a command-line option for mrjob, I have to do like this: class Calculate(MRJob): def configure_args(self): super(Calculate, self).configure_args() self.add_passthru_arg("-t", "--time", help="output…
huy
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TypeError: expected str, bytes or os.PathLike object, not NoneType when running mrjob

I am new to Google Colab and Python. I have directed the files from google drive and was trying to run a Map Reduce with the use of mrjob. import sys sys.argv=['0'] from mrjob.job import MRJob from mrjob.protocol import JSONProtocol,…
Patricia Chang
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how do I get the first letter of every lines from the text file in mrjob mapper in Python?

I am new with the python, I am trying to get the first letter of every lines from the text file in Mrjob , below is my code: def mapper(self, key, value): numCharacters = len(value.strip().replace(" ","")) numWords =…
Jen Fisherman
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How to count the number of times a word sequence appears in a file, using MapReduce in Python?

Consider a file containing words separated by spaces; write a MapReduce program in Python, which counts the number of times each 3-word sequence appears in the file. For example, consider the following file: one two three seven one two three three…
John Whitehouse
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How do you sort a key,value pair using MapReduce?

I have been messing around with MapReduce, still very new to it, and was wondering if I could get some help with a question I'm having trouble answering: I have a txt file of dates and counts and want to sort the dates in ascending order based on…
Kristo Savic
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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 @lasteven04: La jeune Rebecca #Kpossi, nageuse, 18…
horasaab
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Is it possible to pass arguments to mr job

Given the basic example from the mrJob site for a word count program: from mrjob.job import MRJob class MRWordFrequencyCount(MRJob): def mapper(self, _, line): yield "chars", len(line) yield "words", len(line.split()) …
Frank
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Hadoop Found 2 unexpected arguments

I'm running Hadoop on windows and I'm trying to submit an MRJob but it comes back with the error Found 2 unexpected arguments on the command line. (cmtle) d:\>python norad_counts.py -r hadoop --hadoop-streaming-jar…
Cassova
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ValueError: Can't specify both mapper_raw and mapper in Python

I am trying to read fna file with mrjob in Python. This is my load_read.py program, all of the code can work correctly without using mrjob. from mrjob.job import MRJob from Bio import SeqIO from Bio.Seq import Seq import re from operator import…
huy
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mapreduce job failes on hadoop cluster with subprocess failed with code 1

I have a Hadoop 3.2.2 Cluster with 1 namenode/resourceManager and 3 datanodes/NodeManagers. this is my yarn-site config yarn.resourcemanager.hostname bd-1 …
Andre
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mrjob in emr is running only 1 MRStep out of 3 MRSteps and cluster is shutting down

The error looks something like this :- Terminating cluster: j-SDOP2KOKWYZM botocore.exceptions.ClientError: An error occurred (ValidationException) when calling the AddJobFlowSteps operation: A job flow that is shutting down, terminated, or…
Ayush Singh
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How to work out how many mappers are needed for a MapReduce job

Below I have a question that gives us this information. Suppose the program presented in 2a) will be executed on a dataset of 200 million recorded inspections, collecting 2000 days of data. In total there are 1,000,000 unique establishments. The…
Hassan
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MRJob - Iterating over values

Input (Name;Date;Spent): Alice;01/01/2020;100 Alice;02/01/2020;30 Alice;24/01/2020;50 Bob;24/01/2020;1500 Bob;24/01/2020;12 Bob;25/01/2020;16 Bob;25/01/2020;83 Bob;25/01/2020;91 Alice;13/02/2020;10 Alice;25/02/2020;3 The output has to be the name…
set92
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How to run mrjob library python map reduce in ubuntu standalone local hadoop cluster

I went through documentation and it says it is meant for aws, gcp. But they are also using it internally somehow right. So, there should be a way to make it run in our own locally created hadoop cluster in our own virtual box some code for…
Ayush Singh
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Is there way to not include the third argument on the reducer def using mrjob?

I was wondering if there was a way to prevent "Top Ten Salaries" from appearing in my output, but I just want just the list. Here is my code: from mrjob.job import MRJob class MRWordCount(MRJob): def mapper(self,_,lines): for number in…
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