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https://issues.apache.org/jira/browse/MESOS-9460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Mann reassigned MESOS-9460:
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Assignee: Greg Mann
> Speculative operations may make master and agent resource views out of sync.
> ----------------------------------------------------------------------------
>
> Key: MESOS-9460
> URL: https://issues.apache.org/jira/browse/MESOS-9460
> Project: Mesos
> Issue Type: Bug
> Affects Versions: 1.5.1, 1.6.1, 1.7.0
> Reporter: Meng Zhu
> Assignee: Greg Mann
> Priority: Blocker
>
> This bug could happen with the following sequence of events:
> - agent (re)registers with the master
> - speculative operation calls are made to the master
> - the allocator is speculatively updated in
> https://github.com/apache/mesos/blob/master/src/master/master.cpp#L11315
> - before agent resource gets updated, it sends `UpdateSlaveMessage` when
> getting the (re)registered message if it has the capability
> `RESOURCE_PROVIDER` or oversubscription is used
> (https://github.com/apache/mesos/blob/master/src/slave/slave.cpp#L1551 and
> https://github.com/apache/mesos/blob/master/src/slave/slave.cpp#L1633)
> - the `UpdateSlaveMessage` triggers allocator to update the total resources
> with STALE info sent from the agent
> https://github.com/apache/mesos/blob/master/src/master/master.cpp#L8205, thus
> the update from the previous operation is overwritten and LOST
> - agent finishes the operation and informs the master through
> `UpdateOperationStatusMessage` but for the speculative operation, we do not
> update the allocator
> https://github.com/apache/mesos/blob/master/src/master/master.cpp#L11177
> - The resource views of master and agent are out of sync.
> This caused MESOS-7971 and likely MESOS-9458 as well.
> [~chhsia0] proposes to use `resource_version_uuid` to fix this
> (https://issues.apache.org/jira/browse/MESOS-7971?focusedCommentId=16712278&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16712278).
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