[jira] [Created] (AURORA-734) document the behavior of finalization_wait in thermos

["brian wickman (JIRA)" <ji...@apache.org>]

brian wickman created AURORA-734:
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             Summary: document the behavior of finalization_wait in thermos
                 Key: AURORA-734
                 URL: https://issues.apache.org/jira/browse/AURORA-734
             Project: Aurora
          Issue Type: Task
          Components: Documentation
            Reporter: brian wickman
            Priority: Minor


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The current state of affairs is that the default finalization is 30 seconds.  Thermos supports something called the "preemption notice" which roughly translates to "how long we'll allow this task to finalize before we kill everything no matter what."  The idea of preemption notice is that you may have somebody who needs the resources with a higher priority, but is only willing to wait a fixed amount of time for its predecessor to clean up.  (More altruistic preemptors will make this value high if they don't need the resources immediately, e.g. a high priority batch job, but a revenue-critical task could very well make this 0 seconds and give you no opportunity to finalize.)

We never integrated preemption notice into Aurora because the use-case never materialized (also, for many, preemption is fairly rare.)  Instead Thermos just uses a default of 60 seconds.  This means that no matter how big you make the finalization wait, it can never be longer than 60 seconds before Thermos kills everything, so keep that in mind before you use this feature heavily.
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