Stream manager

(Optional) The absolute path of the local directory used to store streams. This value must start with a forward slash (for example, /data).

You must specify an existing folder, and the system user who runs the stream manager component must have permissions to read and write to this folder. For example, you can run the following commands to create and configure a folder, /var/greengrass/streams, which you specify as the stream manager root folder. These commands allow the default system user, ggc_user, to read and write to this folder.

sudo mkdir /var/greengrass/streams
sudo chown ggc_user /var/greengrass/streams
sudo chmod 700 /var/greengrass/streams

Default: /greengrass/v2/work/aws.greengrass.StreamManager

(Optional) The local port number to use to communicate with stream manager.

You can specify 0 to use a random available port.

Default: 8088

(Optional) You can make it mandatory for clients to authenticate before they can interact with stream manager. The Stream Manager SDK controls interaction between clients and stream manager. This parameter determines which clients can call the Stream Manager SDK to work with streams. For more information, see stream manager client authentication.

If you specify true, the Stream Manager SDK allows only Greengrass components as clients.

If you specify false, the Stream Manager SDK allows all processes on the core device to be clients.

Default: true

(Optional) The average maximum bandwidth (in kilobits per second) that stream manager can use to export data.

Default: No limit

(Optional) The maximum number of active threads that stream manager can use to export data.

The optimal size depends on your hardware, stream volume, and planned number of export streams. If your export speed is slow, you can adjust this setting to find the optimal size for your hardware and business case. The CPU and memory of your core device hardware are limiting factors. To start, you might try setting this value equal to the number of processor cores on the device.

Be careful not to set a size that's higher than your hardware can support. Each stream consumes hardware resources, so try to limit the number of export streams on constrained devices.

Default: 5 threads

(Optional) The minimum size (in bytes) of a part in a multipart upload to Amazon S3. Stream manager uses this setting and the size of the input file to determine how to batch data in a multipart PUT request.

Default: 5242880 (5 MB). This is also the minimum value.

(Optional) The logging level for the component. Choose from the following log levels, listed here in level order:

Default: INFO

(Optional) The custom Java Virtual Machine arguments to pass to stream manager at startup. Separate multiple arguments by spaces.

Use this parameter only when you must override the default settings used by the JVM. For example, you might need to increase the default heap size if you plan to export a large number of streams.