We are contemplating whether to allow both CommandInfo and ExecutorInfo on
TaskInfo (MESOS-6294 <https://issues.apache.org/jira/browse/MESOS-6294>).
Currently we only allow one or the other. The motivation is to allow custom
executors a more structured way to pass information (e.g, command) about
Task. Right now custom executors have to get this data via `TaskInfo.bytes`
which is not ideal.
Are there any custom executors out there that crash if they get Tasks with