[MESOS-7682] Agent agent downgrade capability checking.

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Epic Link: Safeguard downgrade with minimum capabilities.
• Assignee: Unassigned
• Reporter: Benjamin Mahler
• Created: 15/Jun/17 21:09
• Updated: 04/May/18 00:34

Description

It would be great if the agent could prevent a downgrade if it reaches a point where a capability becomes required but the downgraded agent does not have the capability.

For example, consider the case that an agent starts writing refined reservations to disk (per the RESERVATION_REFINEMENT capability). At this point, the RESERVATION_REFINEMENT capability becomes required. Ideally, the agent persists this information into its state, so that if the agent is downgraded to a pre-RESERVATION_REFINEMENT state, the old agent could detect that a capability it does not have is required. At this point the old agent could refuse to start. This would prevent a "buggy" downgrade due to the old agent mis-reading the checkpointed resources.

Issue Links

• depends upon: MESOS-6902 Add support for agent capabilities
• is related to: MESOS-7681 Add safeguard for new agents with new features + old master