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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