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Create new services

Learn about creating Controller Services in Cloudera DataFlow Flow Designer.

Services are extension points that provide information for use by other components (such as processors or other controller services). The idea is that, rather than configure this information in every processor that might need it, the service provides it for any processor to use as needed.

You will use the services you create now to configure the behavior of several processors you will add to your flow as you are building it.

  1. Go to Flow Options > Services.


  2. Click Add Service.
    The Add Service page opens.


  3. In the text box, filter for CSVReader.
  4. Provide Service Name: CSVReader_Recent_Changes.
  5. Click Add.
    You do not need to configure the CSVReader_Recent_Changes service. You can leave all properties with their default values.
  6. Click Add Service to create another service.
  7. In the text box, filter for CSVRecordSetWriter.
  8. Provide Service Name: CSVRecordSetWriter_Recent_Changes.
  9. Click Add.
    You do not need to configure the CSVRecordSetWriter_Recent_Changes service. You can leave all properties with their default values.
  10. Select the AvroReader_Recent_Changes service and check the list of Referencing Components in the Service Details pane on the right.
    Make a note of the listed components, because that is where you will need to replace AvroReader_Recent_Changes with the CSVReader_Recent_Changes service.
  11. Select the AvroWriter_Recent_Changes service and check the list of Referencing Components in the Service Details pane on the right.
    Make a note of the listed components, because that is where you will need to replace AvroWriter_Recent_Changes with the CSVRecordSetWriter_Recent_Changes service.
  12. Click Back To Flow Designer to return to the flow design Canvas.
After creating the necessary services, you can start customizing your flow.