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https://issues.apache.org/jira/browse/MESOS-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dominic Hamon updated MESOS-1799:
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Shepherd: Benjamin Mahler
> Reconciliation can send out-of-order updates.
> ---------------------------------------------
>
> Key: MESOS-1799
> URL: https://issues.apache.org/jira/browse/MESOS-1799
> Project: Mesos
> Issue Type: Bug
> Components: master, slave
> Reporter: Benjamin Mahler
> Assignee: Vinod Kone
>
> When a slave re-registers with the master, it currently sends the latest task
> state for all tasks that are not both terminal and acknowledged.
> However, reconciliation assumes that we always have the latest unacknowledged
> state of the task represented in the master.
> As a result, out-of-order updates are possible, e.g.
> (1) Slave has task T in TASK_FINISHED, with unacknowledged updates:
> [TASK_RUNNING, TASK_FINISHED].
> (2) Master fails over.
> (3) New master re-registers the slave with T in TASK_FINISHED.
> (4) Reconciliation request arrives, master sends TASK_FINISHED.
> (5) Slave sends TASK_RUNNING to master, master sends TASK_RUNNING.
> I think the fix here is to preserve the task state invariants in the master,
> namely, that the master has the latest unacknowledged state of the task. This
> means when the slave re-registers, it should instead send the latest
> acknowledged state of each task.
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