🔗CDAP Studio

CDAP supports end-users with self-service batch and real-time data ingestion combined with ETL (extract-transform-load), expressly designed for the building of Hadoop data lakes and data pipelines. Called the CDAP Studio, it provides for CDAP users a seamless and easy method to configure and operate pipelines from different types of sources and data using a visual editor.

You click and drag actions, sources, transforms, sinks, and other plugins to configure a pipeline:

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CDAP Studio: Visual editor showing the creation of a pipeline

Once completed, CDAP provides an operational view of the resulting pipeline that allows for monitoring of metrics, logs, and other runtime information:

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CDAP Pipelines: Administration of created pipelines showing their current status

🔗CDAP Studio Tips

  • Once you have specified an application template for your pipeline and have started adding stages, it cannot be changed for that pipeline. This is because the selection of the application template determines which plugins are available for the pipeline.
  • After clicking on a node, a dialog comes up to allow for configuring of the node. As any changes are automatically saved, you can just close the dialog by either hitting the close button (an X in the upper-right corner), the escape key on your keyboard, or clicking outside the dialog box.
  • To edit a connection made from one node to another node, you can remove the connection by clicking the end with the arrow symbol (click on the white dot) and dragging it off of the target node.
  • All pipelines must have unique names, and a pipeline cannot be saved over an existing pipeline of the same name. Instead, increment the name (from Demo to Demo-1) with each new cloning of a pipeline.

🔗Pipeline Drafts

From within the CDAP Studio, you can save a pipeline you are working on at any time as a draft. The pipeline configuration is saved, and you can resume editing later.

To create a draft, give your pipeline a unique name, and then click the Save button:

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CDAP Studio: Button labels, upper-right toolbar

The draft will be created, and will show in your list of pipelines as a draft. Clicking on it in the list of pipelines will re-open it in the CDAP Studio so that you can continue working on it.

Note that if you change the name of draft, it doesn't create a new draft with the new name, but simply renames the existing draft. Names of drafts must be unique, and names of published pipelines must be unique, though you can have a draft that is the same name as a published pipeline.

To successfully publish such a draft (one whose name matches an existing pipeline), you will need to re-name it to a unique name.

🔗Plugin Templates

Within the CDAP Studio, you can create plugin templates: customized versions of a plugin that are reusable, and can contain pre-configured settings.

Setting can be locked so that they cannot be altered when they are eventually used.

Once a plugin template has been created, it can be edited and deleted at a later time.

Changes to a plugin template do not affect any pipelines created using that template, as those pipelines are created from the artifacts as specified in the plugin template at the time of creation of the pipeline.

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CDAP Studio: Creating a plugin template from the Stream source plugin

🔗Creating a Plugin Template

To create a plugin-template:

  • From within the CDAP Studio, hover your mouse over the plugin you would like to use for your template, such as the Stream source plugin.
  • In the on-hover menu that appears, click the + Template button.
  • The window that appears will allow you to specify the version of the plugin to use. Once you do, the window will expand to allow you to specify the particular properties of that plugin.
  • The template will require a name that uniquely identifies it.
  • You can lock individual properties of the configuration so that they are not editable when the template is used.
  • When the plugin template is successfully saved, it will appear in with the other plugins, with an additional "T" icon to indicate that it is a template.
  • Templates can be either edited or deleted after they are created, using buttons that will appear in their on-hover menu.

Once created, you can use the plugin template just as you would any other plugin, with the advantage that it can be pre-configured with settings that you re-use or require.