Problem
Write a MapReduce code to find users having same DNA in the file stored in HDFS.
Dataset
The file is located at
/data/mr/dna/dna.txt
Sample Output
Output file will have the users having same DNA
ACG ['User5', 'User3']
ACGT ['User4', 'User1']
Steps
Check out mapper.py and reducer.py in GitHub
If you haven't cloned the CloudxLab GitHub repository, then clone it in your home folder in web console using the below command
git clone https://github.com/singhabhinav/cloudxlab.git ~/cloudxlab
Else, update the local copy
cd ~/cloudxlab
git pull origin master
Go to same_dna directory
cd ~/cloudxlab/hdpexamples/python-streaming/same_dna/
Run the MapReduce code using Hadoop streaming. Please make sure to save output in mapreduce-programming/same_dna directory inside your home directory in HDFS. Run the below command
hadoop jar /usr/hdp/current/hadoop-mapreduce-client/hadoop-streaming.jar -input /data/mr/dna/dna.txt -output mapreduce-programming/same_dna -mapper mapper.py -file mapper.py -reducer reducer.py -file reducer.py
In case you cannot find the hadoop streaming command run: find /usr/hdp -name hadoop-streaming.jar
Check the frequency of characters by typing below command.
hadoop fs -cat mapreduce-programming/same_dna/*
Note - Having trouble with the assessment engine? Follow the steps listed here
Loading comments...