Greg Mann created MESOS-9957:
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Summary: Sequence all operations on the agent
Key: MESOS-9957
URL: https://issues.apache.org/jira/browse/MESOS-9957
Project: Mesos
Issue Type: Task
Reporter: Greg Mann
The resolution of MESOS-8582 requires that an asynchronous step be added to the
code path which applies speculative operations like RESERVE and CREATE on the
agent. In order to ensure that the {{FrameworkInfo}} associated with an
incoming operation will be successfully retained, we must first unschedule GC
on the framework meta directory if the framework struct does not exist but that
directory does. By introducing this asynchronous step, we allow the possibility
that an operation may be executed out-of-order with respect to an incoming
dependent LAUNCH or LAUNCH_GROUP.
For example, if a scheduler issues an ACCEPT call containing both a RESERVE
operation as well as a LAUNCH operation containing a task which consumes the
new reserved resources, it's possible that this task will be launched on the
agent before the reserved resources exist.
While we already [sequence task launches on a per-executor
basis|https://github.com/apache/mesos/blob/9297e2d3b0d44b553fc89bcf5f6109c76cc53668/src/slave/slave.cpp#L2337-L2408],
the aforementioned corner case requires that we sequence _all_ offer
operations on a per-framework basis.
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