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https://issues.apache.org/jira/browse/MESOS-4737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erik Weathers updated MESOS-4737:
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Attachment: Reusing Task IDs.pdf
> document TaskID uniqueness requirement
> --------------------------------------
>
> Key: MESOS-4737
> URL: https://issues.apache.org/jira/browse/MESOS-4737
> Project: Mesos
> Issue Type: Task
> Components: documentation
> Affects Versions: 0.27.0
> Reporter: Erik Weathers
> Assignee: Erik Weathers
> Priority: Minor
> Labels: documentation
> Attachments: Reusing Task IDs.pdf
>
>
> There are comments above the definition of TaskID in
> [mesos.proto|https://github.com/apache/mesos/blob/0.27.0/include/mesos/mesos.proto#L63-L66]
> which lead one to believe it is ok to reuse TaskID values so long as you
> guarantee there will only ever be 1 such TaskID running at the same time.
> {code: title=existing comments for TaskID}
> * A framework generated ID to distinguish a task. The ID must remain
> * unique while the task is active. However, a framework can reuse an
> * ID _only_ if a previous task with the same ID has reached a
> * terminal state (e.g., TASK_FINISHED, TASK_LOST, TASK_KILLED, etc.).
> {code}
> However, there are a few scenarios where problems can arise.
> # The checkpointing-and-recovery feature of mesos-slave/agent clashes with
> tasks that reuse an ID and get assigned to the same executor.
> #* See [this
> email|https://mail-archives.apache.org/mod_mbox/mesos-user/201602.mbox/%3CCAO5KYW8%2BXMWc1dXtEo20BAsfGow028jwjL2ubMinP%2BK%2BvdOh8w%40mail.gmail.com%3E]
> for more info, as well as the attachment on this issue.
> # Issues during network partitions and master failover, where a TaskID might
> appear to be unique in the system, whereas in actuality another Task is
> running with that ID and was just partitioned away for some time.
> In light of these issues, we should simply update the document(s) to make it
> abundantly clear that reusing TaskIDs is never ok. At the minimum this
> should involve updating the afore-mentioned comments in {{mesos.proto}}.
> Also any framework development guides that talk about TaskID creation should
> be updated.
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