[jira] [Assigned] (AURORA-1829) Expose stats on preemptor BiCache expirations

["Mehrdad Nurolahzade (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AURORA-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mehrdad Nurolahzade reassigned AURORA-1829:
-------------------------------------------

    Assignee: Mehrdad Nurolahzade

> Expose stats on preemptor BiCache expirations
> ---------------------------------------------
>
>                 Key: AURORA-1829
>                 URL: https://issues.apache.org/jira/browse/AURORA-1829
>             Project: Aurora
>          Issue Type: Task
>          Components: Scheduler
>            Reporter: Mehrdad Nurolahzade
>            Assignee: Mehrdad Nurolahzade
>            Priority: Minor
>              Labels: newbie
>
> We have no visibility into whether reservations made by preemption are actually consumed or simply expire.
> We are currently collecting stats for the size of preemptor {{BiCache}} ({{reservation_cache_size}}). We could additionally collect (a) cache expiration stats and (b) reservation entry removals in {{TaskSchedulerImpl.taskChanged()}} to monitor overall preemption effectiveness. 



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