tTopBy properties for Apache Spark Streaming

Schema and Edit Schema

• A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

  Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

  • View schema: choose this option to view the schema only.

  • Change to built-in property: choose this option to change the schema to Built-in for local changes.

  • Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion.

    If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

  Click Sync columns to retrieve the schema from the previous component connected in the Job.

• Built-In: You create and store the schema locally for this component only.

• Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

Number of line selected

Enter the number of rows to be outputted. The current component selects this number of rows down from the first rows of the sorted data.

Key

Select the column(s) from which the records are used as keys to group the input data.

You need to click [+] to add as many lines as required to use as keys for the grouping to be completed

Criteria

• Click [+] to add as many lines as required for the sort to be completed.

• In the Schema column column, select the column from your schema, which the sort will be based on. Note that the order is essential as it determines the sorting priority.

• In the other columns, select how you need the data to be sorted. For example, if you need to sort the data in ascending alphabetical order (from A to Z), select alpha and asc in the corresponding columns.

Usage rule

This component is used as an intermediate step.

This component, along with the Spark Streaming component Palette it belongs to, appears only when you are creating a Spark Streaming Job.

Note that in this documentation, unless otherwise explicitly stated, a scenario presents only Standard Jobs, that is to say traditional Talend data integration Jobs.

Spark Connection

This connection is effective on a per-Job basis.