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Msingh
Msingh

Reputation: 13

How to Schedule Rscripts using Oozie

I am using Rhadoop on Hortonworks Sandbox to read data from HDFS to R and after reading that in R, I am performing certain operation on that file.

I want to schedule (daily, weekly, monthly) this R script using Oozie.

Any help is strongly appreciated.

Thanks

Upvotes: 1

Views: 1142

Answers (1)

kecso
kecso

Reputation: 2485

It seems somebody did it for you:

Here are the relevant bash script and usage instruction from Oozie R helper on Github.

#!/bin/bash

die () {
    echo >&2 "$@"
    exit 1
}

[ "$#" -eq 3 ] || die "3 arguments required, $# provided"
hdfs_file=$1
r_file=$2
hdfs_output=$3

if [[  ${hdfs_output} =~ ^\/tmp\/.*$ ]]; then
    echo "I will run the r script $2 on the hdfs $1"
    tmp_filename="/tmp/`date +"%Y%m%d.%H%M%S"`"
    echo "using tmp_dir $tmp_filename"
    tmp_output="/tmp/out`date +"%Y%m%d.%H%M%S"`"


    hadoop fs -getmerge $hdfs_file $tmp_filename
    R -f $r_file --args $tmp_filename $tmp_output
    hadoop fs -rmr $hdfs_output
    hadoop fs -put $tmp_output $hdfs_output 

else 
  die "$hdfs_output must be in /tmp/"
fi

Oozie R helper,

The data science team wanted to be able to run R script using oozie,

They wanted to be able to run ETL using Hive and on the result of that ETL they wanted to run the r script.

So I created a bash script that take 3 arguments: 1. The HDFS input of the files they want to run 2. The R script they want to run 3. The output on the hdfs where they want their result to be. (currentlt because the user is mapred I allow only /tmp/)

How to run

You can use a shell oozie action like this:

<shell xmlns="uri:oozie:shell-action:0.1">
            <job-tracker>${jobTracker}</job-tracker>
            <name-node>${nameNode}</name-node>
            <exec>run_r_hadoop.sh</exec>
              <argument>/user/hive/warehouse/dual</argument>
              <argument>count.r</argument>
              <argument>/tmp/r_test</argument>
            <file>count.r#count.r</file>
</shell>

Prequesite

R and all its libraries should be installe on all Hadoop salves, including all the libraries that are used

Upvotes: 2

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