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Atlas Stream Processing

Atlas Stream Processing

sp.process() (mongosh method)

Definition

sp.process()

New in version 7.0: Creates an ephemeral Stream Processor on the current Stream Processing Workspace.

Compatibility

This method is supported in Atlas Stream Processing Workspaces.

Syntax

The sp.process() method has the following syntax:

sp.process(
  [
    <pipeline>
  ]
)

Command Fields

sp.createStreamProcessor() takes these fields:

Field	Type	Necessity	Description
`pipeline`	array	Required	Stream aggregation pipeline you want to apply to your streaming data.

Behavior

sp.process() creates an ephemeral, unnamed stream processor on the current stream processing workspace and immediately initializes it. This stream processor only persists as long as it runs. If you terminate an ephemeral stream processor, you must create it again in order to use it.

Access Control

The user running sp.process() must have the atlasAdmin role.

Example

The following example creates an ephemeral stream processor which ingests data from the sample_stream_solar connection. The processor excludes all documents where the value of the device_id field is device_8, passing the rest to a tumbling window with a 10-second duration. Each window groups the documents it receives, then returns various useful statistics of each group. The stream processor then merges these records to solar_db.solar_coll over the mongodb1 connection.

sp.process(
  [
    {
      $source: {
        connectionName: 'sample_stream_solar',
        timeField: {
          $dateFromString: {
            dateString: '$timestamp'
          }
        }
      }
    },
    {
      $match: {
        $expr: {
          $ne: [
            "$device_id",
            "device_8"
          ]
        }
      }
    },
    {
      $tumblingWindow: {
        interval: {
          size: Int32(10),
          unit: "second"
        },
        "pipeline": [
          {
            $group: {
              "_id": {  "device_id": "$device_id" },
              "max_temp": { $max: "$obs.temp" },
              "max_watts": { $max: "$obs.watts" },
              "min_watts": { $min: "$obs.watts" },
              "avg_watts": { $avg: "$obs.watts" },
              "median_watts": {
                                $median: {
                                  input: "$obs.watts",
                                  method: "approximate"
                                }
                              }
            }
          }
        ]
      }
    },
    {
      $merge: {
        into: {
          connectionName: "mongodb1",
          db: "solar_db",
          coll: "solar_coll"
        },
        on: ["_id"]
      }
    }
  ]
)

Learn More

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sp.listStreamProcessors

sp.processor.drop