[MESOS-5581] Guarantee ordering between Isolators

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Labels: isolator mesosphere
• Sprint: Mesosphere Sprint 36
• Story Points: 3
• Assignee: Kevin Klues
• Reporter: Kevin Klues
• Shepherd: Benjamin Mahler
• Created: 09/Jun/16 07:26
• Updated: 20/Sep/17 22:17
• Resolved: 16/Jun/16 22:43

Description

Some isolators depend on other isolators. However, we currently do not have a generic method of expressing these dependencies. We special case the `filesystem/*` isolators to make sure that dependencies on them are satisfied, but no other dependencies can be expressed.

Instead, we should use a vector to represent the pairing of isolator name to isolator creator function. This way, the relative dependencies between each isolator will be implicit in the ordering of the vector. Currently, a hashmap is used to hold this pairing, but this is inadequate because hashmaps are inherently unordered. The new implementation using a vector will ensure everything is processed in the order it is listed.

Issue Links

• relates to: MESOS-7643 The order of isolators provided in '--isolation' flag is not preserved and instead sorted alphabetically