[jira] [Created] (YUNIKORN-3318) Deadlock in preemption init caused by app reservations

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

Wilfred Spiegelenburg created YUNIKORN-3318:
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             Summary: Deadlock in preemption init caused by app reservations
                 Key: YUNIKORN-3318
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-3318
             Project: Apache YuniKorn
          Issue Type: Bug
          Components: core - scheduler
    Affects Versions: 1.8.0
            Reporter: Wilfred Spiegelenburg
            Assignee: Wilfred Spiegelenburg


If an application {{A}} holds a reservation {{R}} on a node {{N}} the preemption initialisation will deadlock.

During the {{initWorkingState()}} call reservations are released from a node if they are older than the timeout and the priority is lower than the allocation we are trying to preempt for. This is done as reserved nodes are excluded from preemption. The initialisation is called by the scheduling cycle which holds the application lock. The release of the reservation via {{UnReserve()}} requires that same application lock.
Removing the reservation from the queue also requires the same application lock as we need to get the queue from the application that holds the reservation.



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