pipelines/components/gcp/dataproc/submit_hadoop_job

Name

Component: Data preparation using Hadoop MapReduce on YARN with Cloud Dataproc

Labels

Cloud Dataproc, Hadoop, YARN, Apache, MapReduce

Summary

A Kubeflow pipeline component to prepare data by submitting an Apache Hadoop MapReduce job on Apache Hadoop YARN to Cloud Dataproc.

Facets

Use case:

Technique:

Input data type:

ML workflow:

Details

Intended use

Use the component to run an Apache Hadoop MapReduce job as one preprocessing step in a Kubeflow pipeline.

Runtime arguments

Argument	Description	Optional	Data type	Accepted values	Default
project_id	The Google Cloud Platform (GCP) project ID that the cluster belongs to.	No	GCPProjectID	-	-
region	The Dataproc region to handle the request.	No	GCPRegion	-	-
cluster_name	The name of the cluster to run the job.	No	String	-	-
main_jar_file_uri	The Hadoop Compatible Filesystem (HCFS) URI of the JAR file containing the main class to execute.	No	List	-	-
main_class	The name of the driver's main class. The JAR file that contains the class must be either in the default CLASSPATH or specified in hadoop_job.jarFileUris.	No	String	-	-
args	The arguments to pass to the driver. Do not include arguments, such as -libjars or -Dfoo=bar, that can be set as job properties, since a collision may occur that causes an incorrect job submission.	Yes	List	-	None
hadoop_job	The payload of a HadoopJob.	Yes	Dict	-	None
job	The payload of a Dataproc job.	Yes	Dict	-	None
wait_interval	The number of seconds to pause between polling the operation.	Yes	Integer	-	30

Note:

main_jar_file_uri: The examples for the files are:

• gs://foo-bucket/analytics-binaries/extract-useful-metrics-mr.jar
• hdfs:/tmp/test-samples/custom-wordcount.jarfile:///home/usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar

Output

Name	Description	Type
job_id	The ID of the created job.	String

Cautions & requirements

To use the component, you must:

• Set up a GCP project by following this guide.
• Create a new cluster.
• The component can authenticate to GCP. Refer to Authenticating Pipelines to GCP for details.
• Grant the Kubeflow user service account the role, roles/dataproc.editor, on the project.

Detailed description

This component creates a Hadoop job from the Dataproc submit job REST API.

Follow these steps to use the component in a pipeline:

1. Install the Kubeflow pipeline's SDK:

   %%capture --no-stderr
   
   !pip3 install kfp --upgrade
   

2. Load the component using the Kubeflow pipeline's SDK:

   import kfp.components as comp
   
   dataproc_submit_hadoop_job_op = comp.load_component_from_url('https://raw.githubusercontent.com/kubeflow/pipelines/1.4.0-rc.1/components/gcp/dataproc/submit_hadoop_job/component.yaml')
   help(dataproc_submit_hadoop_job_op)
   

Sample

The following sample code works in an IPython notebook or directly in Python code. See the sample code below to learn how to execute the template.

Setup a Dataproc cluster

Create a new Dataproc cluster (or reuse an existing one) before running the sample code.

Prepare a Hadoop job

Upload your Hadoop JAR file to a Cloud Storage bucket. In the sample, we will use a JAR file that is preinstalled in the main cluster, so you don't have to provide the argument, main_jar_file_uri.

To package a self-contained Hadoop MapReduce application from the WordCount example source code, follow the MapReduce Tutorial.

Set sample parameters

PROJECT_ID = '<Put your project ID here>'
CLUSTER_NAME = '<Put your existing cluster name here>'
OUTPUT_GCS_PATH = '<Put your output GCS path here>'
REGION = 'us-central1'
MAIN_CLASS = 'org.apache.hadoop.examples.WordCount'
INTPUT_GCS_PATH = 'gs://ml-pipeline-playground/shakespeare1.txt'
EXPERIMENT_NAME = 'Dataproc - Submit Hadoop Job'

Inspect the input data

The input file is a simple text file:

!gsutil cat $INTPUT_GCS_PATH

Clean up the existing output files (optional)

This is needed because the sample code requires the output folder to be a clean folder. To continue to run the sample, make sure that the service account of the notebook server has access to OUTPUT_GCS_PATH.

Caution: This will remove all blob files under OUTPUT_GCS_PATH.

!gsutil rm $OUTPUT_GCS_PATH/**

Example pipeline that uses the component

import kfp.dsl as dsl
import json
@dsl.pipeline(
    name='Dataproc submit Hadoop job pipeline',
    description='Dataproc submit Hadoop job pipeline'
)
def dataproc_submit_hadoop_job_pipeline(
    project_id = PROJECT_ID, 
    region = REGION,
    cluster_name = CLUSTER_NAME,
    main_jar_file_uri = '',
    main_class = MAIN_CLASS,
    args = json.dumps([
        INTPUT_GCS_PATH,
        OUTPUT_GCS_PATH
    ]), 
    hadoop_job='', 
    job='{}', 
    wait_interval='30'
):
    dataproc_submit_hadoop_job_op(
        project_id=project_id, 
        region=region, 
        cluster_name=cluster_name, 
        main_jar_file_uri=main_jar_file_uri, 
        main_class=main_class,
        args=args, 
        hadoop_job=hadoop_job, 
        job=job, 
        wait_interval=wait_interval)

Compile the pipeline

pipeline_func = dataproc_submit_hadoop_job_pipeline
pipeline_filename = pipeline_func.__name__ + '.zip'
import kfp.compiler as compiler
compiler.Compiler().compile(pipeline_func, pipeline_filename)

Submit the pipeline for execution

#Specify values for the pipeline's arguments
arguments = {}

#Get or create an experiment
import kfp
client = kfp.Client()
experiment = client.create_experiment(EXPERIMENT_NAME)

#Submit a pipeline run
run_name = pipeline_func.__name__ + ' run'
run_result = client.run_pipeline(experiment.id, run_name, pipeline_filename, arguments)

Inspect the output

The sample in the notebook will count the words in the input text and save them in sharded files. The command to inspect the output is:

!gsutil cat $OUTPUT_GCS_PATH/*

References

• Component Python code
• Component Docker file
• Sample notebook
• Dataproc HadoopJob

License

By deploying or using this software you agree to comply with the AI Hub Terms of Service and the Google APIs Terms of Service. To the extent of a direct conflict of terms, the AI Hub Terms of Service will control.