An example aggregation on the public Kartlytics corpus. See http://kartlytics.com for details. Originally from https://github.com/davepacheco/kartlytics

kart-aggr.json

{
  "phases": [
    {
      "type": "map",
      "assets": ["/manta/public/kartlytics/bin/video-metadata"],
      "exec": "/assets/manta/public/kartlytics/bin/video-metadata /$MANTA_USER/public $MANTA_INPUT_FILE"
    },
    {
      "type": "reduce",
      "exec": "json -g | mpipe /$MANTA_USER/public/kartlytics-summary.json"
    }
  ]
}