Configure Amazon IoT Greengrass stream manager

Parameter name: STREAM_MANAGER_STORE_ROOT_DIR

The absolute path of the local folder 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

For information about securing stream data, see Local data security.

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

Parameter name: STREAM_MANAGER_SERVER_PORT

The local port number used to communicate with stream manager. The default is 8088.

You can specify 0 to use a random available port.

Parameter name: STREAM_MANAGER_AUTHENTICATE_CLIENT

Indicates whether clients must be authenticated to interact with stream manager. All interaction between clients and stream manager is controlled by the Stream Manager SDK. This parameter determines which clients can call the Stream Manager SDK to work with streams. For more information, see Client authentication.

Valid values are true or false. The default is true (recommended).

Parameter name: STREAM_MANAGER_EXPORTER_MAX_BANDWIDTH

The average maximum bandwidth (in kilobits per second) that can be used to export data. The default allows unlimited use of available bandwidth.

Parameter name: STREAM_MANAGER_EXPORTER_THREAD_POOL_SIZE

The maximum number of active threads that can be used to export data. The default is 5.

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.

Parameter name: JVM_ARGS

Custom Java Virtual Machine arguments to pass to stream manager at startup. Multiple arguments should be separated 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.

Parameter name: LOG_LEVEL

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

Default: INFO

Parameter name: STREAM_MANAGER_EXPORTER_S3_DESTINATION_MULTIPART_UPLOAD_MIN_PART_SIZE_BYTES

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. The default and minimum value is 5242880 bytes (5 MB).