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Status Future consideration
Workspace Spectrum Symphony
Components Version 7.3.2
Created by Guest
Created on Feb 24, 2023

RELATED IDEAS

AWS spot eviction mechanism does not trigger onServiceInterrupt() event

CVA is using spot servers on AWS. The application is highly depending on the onServiceInterrupt() to properly shutdown the task when spot eviction happens. If the running task can not receive the onServiceInterrupt() and close its output files properly, next time the same task will fail because this it has missed the last few bits of the update to the files.
Per my conversation with David Kheyman (from AWS), he told us that, on the spot nodes, they do send the signal to the processes that are running on the spot server... but that have to be pulled by the processes who are interested. Here is the information that Amazon has published (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-instance-termination-notices.html)

From Amazon themselves: We recommend that you check for these interruption notices every 5 seconds.

There is one more document "best practice"

https://aws.amazon.com/blogs/compute/best-practices-for-handling-ec2-spot-instance-interruptions/

Needed By Week
  • Admin
    Dennis Xiao
    Reply
    |     Mar 2, 2023

    As discussed, suggest to use "egosh resource close -reclaim" once detect the spot eviction happens outside of Symphony.

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