This scenario applies only to subscription-based Talend products with Big Data.
For more technologies supported by Talend, see Talend components.
The tDataprepRun component allows you to reuse an existing preparation made in Talend Data Preparation or Talend Cloud Data Preparation, directly in a big data Job. In other words, you can operationalize the process of applying a preparation to input data with the same model.
The following scenario creates a simple Job that :
- Reads a small sample of customer data,
- applies an existing preparation on this data,
- shows the result of the execution in the console.
This assumes that a preparation has been created beforehand, on a dataset with the same schema as your input data for the Job. In this case, the existing preparation is called datapreprun_spark.
This simple preparation puts the customer last names into upper case and applies a filter to isolate the customers from California, Texas and Florida.
Note that if a preparation contains actions that only affect a single row, or cells, they will be skipped by the tDataprepRun component during the job. The Make as header or Delete Row functions for example, do not work in a big data context.
James;Butt;California Daniel;Fox;Connecticut Donna;Coleman;Alabama Thomas;Webb;Illinois William;Wells;Florida Ann;Bradley;California Sean;Wagner;Florida Elizabeth;Hall;Minnesota Kenneth;Jacobs;Florida Kathleen;Crawford;Texas Antonio;Reynolds;California Pamela;Bailey;Texas Patricia;Knight;Texas Todd;Lane;New Jersey Dorothy;Patterson;Virginia
tHDFSConfiguration is used in this scenario by Spark to connect to the HDFS system where the jar files dependent on the Job are transferred.
Yarn mode (Yarn client or Yarn cluster):
When using Google Dataproc, specify a bucket in the Google Storage staging bucket field in the Spark configuration tab.
When using HDInsight, specify the blob to be used for Job deployment in the Windows Azure Storage configuration area in the Spark configuration tab.
- When using Altus, specify the S3 bucket or the Azure Data Lake Storage for Job deployment in the Spark configuration tab.
When using on-premise distributions, use the configuration component corresponding to the file system your cluster is using. Typically, this system is HDFS and so use https://help.talend.com/access/sources/content/topic?pageid=thdfsconfiguration&mapid=hdfs&afs:lang=en&EnrichVersion=8.0.
Standalone mode: use the configuration component corresponding to the file system your cluster is using, such as tHDFSConfiguration or tS3Configuration.
If you are using Databricks without any configuration component present in your Job, your business data is written directly in DBFS (Databricks Filesystem).
Prerequisite: ensure that the Spark cluster has been properly installed and is running.