Developing Workflow Tasks

Workflow tasks can be either AWS Lambda Functions or ECS Activities.

Lambda functions

You can use one of the many @cumulus node modules to take advantage of common functionality for Cumulus workflows, such as @cumulus/parse-pdr and @cumulus/post-to-cmr.

The full set of available lambda functions can be found on npm: npmjs.com/org/cumulus and in source code: cumulus/tasks.

You can also develop your own lambda function, read more on the Lambda Functions page.

ECS Activities

ECS activities require a docker image. The docker image is defined as part of the ECS cluster definition in your deployments config.yml, e.g.:

  ecs:
    instanceType: t2.small
    desiredInstances: 1
    availabilityZone: us-east-1a
    imageId: ami-a7a242da
    publicIp: true
    docker:
      username: cumulususer
    services:
      EcsTaskHelloWorld:
        image: cumuluss/cumulus-ecs-task:1.0.2
        cpu: 800
        memory: 1500
        count: 1