[MESOS-6299] Master doesn't remove task from pending when it is invalid

• Type: Improvement
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.28.3, 1.0.2, 1.1.0
• Labels: mesosphere
• Epic Link: pods
• Sprint: Mesosphere Sprint 44
• Story Points: 2
• Assignee: Vinod Kone
• Reporter: Vinod Kone
• Shepherd: Anand Mazumdar
• Created: 30/Sep/16 18:52
• Updated: 22/Mar/19 16:40
• Resolved: 30/Sep/16 20:31

Description

In `Master::_accept()` there are cases when a task is not launched (e.g, agent disconnected, agent removed or task group is invalid). Doesn't look like we make sure the task is removed from `framework->pending` in this case. In addition to the memory leak reconciliation will result in a scheduler thinking the task is still in TASK_STAGING. Same for operators who are looking at operator endpoints.

Note that pending task not being removed when agent is disconnected/removed is a long standing bug. We should fix it in all the supported versions.