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ECS task notification

In ECS scheduler, hako oneshot supports multiple methods of detecting task finish.

ecs:DescribeTasks (default)

Use DescribeTasks API to get the task status. This method can be used without any preparation or configuration, but the DescribeTasks API can return "Rate exceeded" error when there's several running hako oneshot processes.

s3:GetObject

Amazon ECS has integration with Amazon CloudWatch Events. The integration notifies ECS task state changes to AWS Lambda, Amazon SNS, Amazon SQS, and so on. http://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html#ecs_task_events

Amazon S3 is a good storage for polling, so connecting CloudWatch Events to AWS Lambda and put the payload to S3 is more scalable than ecs:DescribeTasks.

The example implementation of AWS Lambda can be found in ../examples/put-ecs-container-status-to-s3 directory.

To enable task notification with S3, you have to configure scheduler in definition file.

{
  scheduler: {
    type: 'ecs',
    oneshot_notification_prefix: 's3://ecs-task-notifications/task_statuses?region=ap-northeast-1',
  },
}

It uses ecs-task-notifications bucket in ap-northeast-1 region.