OpenDroneMap-WebODM/slate/source/includes/reference/_processingnode.md

Processing Node

Example processing node:

{
    "id": 2,
    "online": true,
    "hostname": "nodeodm.masseranolabs.com",
    "port": 80,
    "api_version": "1.0.1",
    "last_refreshed": "2017-03-01T21:14:49.918276Z",
    "queue_count": 0,
    "max_images": null,
    "available_options": [
        {
            "help": "Oct-tree depth at which the Laplacian equation is solved in the surface reconstruction step. Increasing this value increases computation times slightly but helps reduce memory usage. Default: 9",
            "name": "mesh-solver-divide",
            "type": "int",
            "value": "9",
            "domain": "positive integer"
        },
    ...

Processing nodes are associated with zero or more tasks and take care of processing input images. Processing nodes are computers or virtual machines running NodeODM or any other API compatible with it.

Field	Type	Description
id	int	Unique Identifier
online	bool	Whether the processing node could be reached in the last 5 minutes
hostname	string	Hostname/IP address
port	int	Port
api_version	string	Version of NodeODM currently running
last_refreshed	string	Date and time this node was last seen online. This value is typically refreshed every 15-30 seconds and is used to decide whether a node is offline or not
queue_count	int	Number of Task items currently being processed/queued on this node.
max_images	int	Optional maximum number of images this processing node can accept. null indicates no limit.
available_options	JSON[]	JSON-encoded list of options that this node is capable of handling. See Available Options for more information

Available Options

Name	Description
help	Description of the option
name	Name that identifies the option. This is the value you pass in the name key/value pair when creating a set of options for a new Task
type	Possible values are int, float, string, bool
value	Default value if the option is not specified
domain	Restriction of the range of values that this option allows. Examples are float, negative integer, percent, float: 0 <= x <= 10, etc. for all possible values, check NodeODM's odmOptions.js code

Add a processing node

POST /api/processingnodes/

Parameter	Required	Default	Description
hostname	*	""	Hostname/IP address
port	*		Port

All other fields are automatically populated, and shouldn't generally be specified.

Update a processing node

PATCH /api/processingnodes/

Parameters are the same as above.

Delete a processing node

DELETE /api/processingnodes/

Upon deletion, all Task items associated with the node will continue to exist. You might get errors (duh!) if you delete a processing node in the middle of processing a Task.

Get list of processing nodes

GET /api/processingnodes/

Parameter	Required	Default	Description
id		""	Filter by id
hostname		""	Filter by hostname
port		""	Filter by port
api_version		""	Filter by API version
queue_count		""	Filter by queue count
max_images		""	Filter by max images
ordering		""	Ordering field to sort results by
has_available_options		""	Return only processing nodes that have a valid set of processing options (check that the available_options field is populated). Either true or false.

Example: Show only nodes that have a valid set of options

GET /api/processingnodes/?has_available_options=true

Example: Sorting

GET /api/processingnodes/?ordering=-hostname

Sort by hostname, descending order.

Only processing nodes visible to the current user are returned. If you added a processing node, but your non-admin users can't see it, make sure that they have been assigned the proper permissions. Administration -- Processing Nodes -- Select Node -- Object Permissions -- Add User/Group and check CAN VIEW PROCESSING NODE.

Processing Options

Processing options example:

[
    {
        "help": "Oct-tree depth at which the Laplacian equation is solved in the surface reconstruction step. Increasing this value increases computation times slightly but helps reduce memory usage. Default: 9",
        "name": "mesh-solver-divide",
        "type": "int",
        "value": "9",
        "domain": "positive integer"
    },
    {
        "help": "Ignore matched keypoints if the two images share less than <float> percent of keypoints. Default: 2",
        "name": "matcher-threshold",
        "type": "float",
        "value": "2",
        "domain": "percent"
    },
    ...

GET /api/processingnodes/options/

Display the common options available among all online processing nodes. This is calculated by intersecting the available_options field of all online processing nodes visible to the current user.

Use this list of options to check whether a particular option is supported by all online processing nodes. If you use the automatic processing node assignment feature for processing tasks, this is the list you want to display to the user for choosing the options to use during processing.

While WebODM is capable of handling processing nodes running different versions of NodeODM, we don't recommend doing so. When all processing nodes use the same NodeODM version, the output of this API call will be identical to the available_options field of any node.