[MESOS-6865] Remove the constraint of being only able to launch 2 level nested containers on Agent API

• Type: Improvement
• Status: Resolved
• Priority: Blocker
• Resolution: Duplicate
• Fix Version/s: 1.2.0
• Labels: mesosphere
• Target Version/s: 1.2.0
• Epic Link: Mesos Container Attach/Exec
• Assignee: Unassigned
• Reporter: Anand Mazumdar
• Created: 05/Jan/17 19:12
• Updated: 06/Feb/17 08:58
• Resolved: 05/Jan/17 19:16

Description

Currently, the Agent API has a constraint that it only allows two level of nesting. This was done at that time since the containerizer was still being worked on to support arbitrary level of nesting. Now, that the work has been completed we should remove the constraint on the API handlers on the agent.

Note that this constraint also impacts the Debugging API i.e., a user currently can't attach to a task (child container) of a task group since we explicitly check that the top level container belongs to an executor on the API handler.
https://github.com/apache/mesos/blob/f89f28724f5837ff414dc6cc84e1afb63f3306e5/src/slave/http.cpp#L2189

Issue Links

• is duplicated by: MESOS-6864 Container Exec should be possible with tasks belonging to a task group