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

["Benjamin Mahler (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-6568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Mahler reassigned MESOS-6568:
--------------------------------------

    Assignee: Benjamin Mahler

> 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
>            Assignee: Benjamin Mahler
>            Priority: Major
>              Labels: mesosphere
>
> 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:
> # Consistency with the old HTTP endpoints, e.g., /state
> # 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.
> *NOTE: The [asV1Protobuf|https://github.com/apache/mesos/blob/d10a33acc426dda9e34db995f16450faf898bb3b/src/common/http.cpp#L172-L423] copy needs to also be updated.*



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