[jira] [Created] (MESOS-6568) JSON serialization should not omit empty arrays in HTTP APIs

["Neil Conway (JIRA)" <ji...@apache.org>]

Neil Conway created MESOS-6568:
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             Summary: JSON serialization should not omit empty arrays in HTTP APIs
                 Key: MESOS-6568
                 URL: https://issues.apache.org/jira/browse/MESOS-6568
             Project: Mesos
          Issue Type: Improvement
          Components: HTTP API
            Reporter: Neil Conway


When using the JSON content type with the HTTP APIs, a {{repeated}} protobuf field is omitted entirely from the JSON serialization of the message. For example, this is a response to the {{GetTasks}} call:

{noformat}
{
  "get_tasks": {
    "tasks": [{...}]
  },
  "type": "GET_TASKS"
}
{noformat}

I think it would be better to include empty arrays for the other fields of the message ({{pending_tasks}}, {{completed_tasks}}, etc.). Advantages:

1. Consistency with the old HTTP endpoints, e.g., /state
2. Semantically, an empty array is more accurate. The master's response should be interpreted as saying it doesn't know about any pending/completed tasks; that is more accurately conveyed by explicitly including an empty array, not by omitting the key entirely.



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