Benjamin Mahler created MESOS-7865:
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Summary: Agent may process a kill task and still launch the task.
Key: MESOS-7865
URL: https://issues.apache.org/jira/browse/MESOS-7865
Project: Mesos
Issue Type: Bug
Components: agent
Reporter: Benjamin Mahler
Assignee: Benjamin Mahler
Based on the investigation of MESOS-7744, the agent has a race in which
"queued" tasks can still be launched after the agent has processed a kill task
for them. This race was introduced when {{Slave::statusUpdate}} was made
asynchronous:
(1) {{Slave::__run}} completes, task is now within {{Executor::queuedTasks}}
(2) {{Slave::killTask}} locates the executor based on the task ID residing in
queuedTasks, calls {{Slave::statusUpdate()}} with {{TASK_KILLED}}
(3) {{Slave::___run}} assumes that killed tasks have been removed from
{{Executor::queuedTasks}}, but this now occurs asynchronously in
{{Slave::_statusUpdate}}. So, the executor still sees the queued task and
delivers it and adds the task to {{Executor::launchedTasks}}.
(3) {{Slave::_statusUpdate}} runs, removes the task from
{{Executor::launchedTasks}} and adds it to {{Executor::terminatedTasks}}.
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