StreamLab Sinks Overview

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StreamLab Sinks Overview

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A sink is a destination for rows of data, usually an external file system, message bus, or database. In s-Server, a sink consists of a stream and a pump to fill it (a pump moves data from one location to another. Internally, StreamLab uses sinks to connect guides with each other.

From the Sinks page you can create a range of sinks, such as those that write to files, message buses, or external databases. When you create a sink you define its columns by name and type (for example, "Temperature" type DOUBLE).

Once you create sinks, they are available via the route to sink option in guides. When you route to a sink from a guide, you select which columns being output by the guide are routed to each columns in your sink.

You can also create an internal sink automatically from the current output view in a guide. See Routing Data to a Sink for more details.

You can add the following types of sinks:

A CSV sink streams rows in comma-separated value form to a file, socket, AMQP or Kafka destination.
A JSON sink streams rows in JavaScript Object Notation form to a file, socket, AMQP or Kafka destination.
An XML sink streams rows in eXtensible Markup Language form to a file, socket, AMQP or Kafka destination.
An External Table sink streams rows into a table in an external database. (These must be created as external connections first. See Adding an External Connection for more details.)
Stream and Table sinks stream rows to s-Server streams and tables. (These must be previously defined.)

You can use sinks to route data to external datastreams (such as Extensible Common Data Adapter outputs and external databases). You can also use them as the basis for other guides.


Creating a Sink

You add sinks in the same way you do sources, guides, or external connections, by dragging your desired source type from the left hand column into the middle column:


Next, click the newly added sink to configure it. See the following topics for details on configuring sinks:

Adding a CSV Sink
Adding a JSON Sink
Adding an XML Sink
Adding an External Table Sink
Adding an s-Server Stream Sink
Adding an s-Server Table Sink