[jira] [Created] (YUNIKORN-287) ask release can cause multiple reservations to be released

["Wilfred Spiegelenburg (Jira)" <ji...@apache.org>]

Wilfred Spiegelenburg created YUNIKORN-287:
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             Summary: ask release can cause multiple reservations to be released
                 Key: YUNIKORN-287
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-287
             Project: Apache YuniKorn
          Issue Type: Bug
          Components: core - scheduler
            Reporter: Wilfred Spiegelenburg
            Assignee: Wilfred Spiegelenburg


complex scenario with multiple things going on:
- one application with multiple pending requests
- two or more pending requests are reserved
- one of those reserved pending requests is being allocated (scheduler is done, cache confirm is called async)
- the request being allocated is cancelled by the shim in between the time the scheduler is done and the cache confirms

The cancellation of the shim triggers an update and the cache update triggers an update. These two updates cause counters for the number of reservations to be decremented twice.

The side effect is that the node that is reserved by the ask that is not removed will be skipped until that ask is allocated on a different node. If that takes a while (waiting for scale up for instance) then there will be an impact on scheduling.



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