[jira] [Created] (MESOS-6779) Consider rejecting reuse of task IDs

["Neil Conway (JIRA)" <ji...@apache.org>]

Neil Conway created MESOS-6779:
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             Summary: Consider rejecting reuse of task IDs
                 Key: MESOS-6779
                 URL: https://issues.apache.org/jira/browse/MESOS-6779
             Project: Mesos
          Issue Type: Improvement
          Components: master
            Reporter: Neil Conway


At present, frameworks are allowed to reuse task IDs, _if_ the previous task with that ID has reached a terminal state. However, reusing task IDs is discouraged, for two reasons:

# It is not always trivial to determine that a task has truly terminated, e.g., due to network partitions.
# Reusing task IDs makes it harder to interpret log files and diagnostic information, since we generally assume that a task ID unambiguously identifies a single task.

Rather than discouraging but supporting this behavior, we could instead have the master try to reject attempts to reuse completed task IDs. Because the master's list of completed tasks is a limited-size cache (which is not preserved across master restart or failover), the master's checks for reusing task IDs would likely be sound but not complete (i.e., we wouldn't be able to catch _all_ situations in which completed task IDs are reused without paying a prohibitive performance cost).



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