Neil Conway created MESOS-6206:
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Summary: Change reconciliation to return results for in-progress
removals and reregistrations
Key: MESOS-6206
URL: https://issues.apache.org/jira/browse/MESOS-6206
Project: Mesos
Issue Type: Bug
Components: master
Reporter: Neil Conway
Assignee: Neil Conway
The master does not return any reconciliation results for agents it views as
"transitioning". An agent is defined as transitioning if any of the following
are true:
1. The master recovered from the registry after failover but the agent has not
yet reregistered
2. The master is in the process of removing an admitted agent from the registry
3. The master is in the process of re-registering an agent (i.e., re-adding it
to the list of admitted agents).
I think case #1 makes sense but cases #2 and #3 do not. Before the registry
operation completes, we should instead view the slave as still being in its
previous state ("admitted" for case 2 and not-admitted/unreachable/etc. for
case 3).
Reasons to make this change:
1. Improve consistency with output of endpoints, etc.: until the registry
operation to remove/re-admit a slave finishes, we show the previous state of
the slave in the HTTP endpoints. Returning reconciliation results that are
consistent with HTTP endpoint values is sensible.
2. It is simpler. Rather than not sending anything to frameworks and requiring
that they ask us again later, it is simpler to just send the current state of
the agent. If that state changes (whether due to the registry operation
succeeding or a subsequent state change), then the reconciliation results might
be stale -- so be it. Such stale information fundamentally cannot be avoided.
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