[MESOS-8824] Send the task's latest "status update state" to frameworks when an unreachable agent reregisters.

• Type: Bug
• Status: Reviewable
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.5.0, 1.6.0, 1.7.0
• Target Version/s: 1.5.4, 1.6.3, 1.8.1, 1.9.0, 1.7.4
• Assignee: Yan Xu
• Reporter: Yan Xu
• Created: 23/Apr/18 22:20
• Updated: 29/Apr/20 05:02

Description

With MESOS-6406 the master started to actively send frameworks status updates for reregistering agents if the agent:

• has previously been removed by the master for being unreachable or
• is unknown to the master due to the garbage collection of the
  unreachable and gone agents in the registry and the master's state.

However we sent the task's latest state instead of its latest status update state which means the framework could first get an update with a TASK_FINISHED and then later TASK_RUNNING.

This is inconsistent with the handling of other master generated updates, e.g,. during reconciliation; we should send the status update state instead.