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https://issues.apache.org/jira/browse/MESOS-9740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16825261#comment-16825261
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Joseph Wu commented on MESOS-9740:
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Yes. We expect the upgrade to work for most people. However, our test cluster
had a relatively wide variety of tasks; and just a single bad framework,
launching 1+ task on each agent, could cripple the upgrade.
I should clarify that this affects 1.8.x **masters**. A 1.7.x agent _might_
have trouble registering with a 1.8.x master due to this bug.
> Invalid protobuf unions in ExecutorInfo::ContainerInfo will prevent agents
> from reregistering with 1.8+ masters
> ---------------------------------------------------------------------------------------------------------------
>
> Key: MESOS-9740
> URL: https://issues.apache.org/jira/browse/MESOS-9740
> Project: Mesos
> Issue Type: Bug
> Affects Versions: 1.8.0
> Reporter: Joseph Wu
> Assignee: Benno Evers
> Priority: Blocker
> Labels: foundations, mesosphere
>
> As part of MESOS-6874, the master now validates protobuf unions passed as
> part of an {{ExecutorInfo::ContainerInfo}}. This prevents a task from
> specifying, for example, a {{ContainerInfo::MESOS}}, but filling out the
> {{docker}} field (which is then ignored by the agent).
> However, if a task was already launched with an invalid protobuf union, the
> same validation will happen when the agent tries to reregister with the
> master. In this case, if the master is upgraded to validate protobuf unions,
> the agent reregistration will be rejected.
> {code}
> master.cpp:7201] Dropping re-registration of agent at
> slave(1)@172.31.47.126:5051 because it sent an invalid re-registration:
> Protobuf union `mesos.ContainerInfo` with `Type == MESOS` should not have the
> field `docker` set.
> {code}
> This bug was found when upgrading a 1.7.x test cluster to 1.8.0. When
> MESOS-6874 was committed, I had assumed the invalid protobufs would be rare.
> However, on the test cluster, 13/17 agents had at least one invalid
> ContainerInfo when reregistering.
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