Jason Dere commented on HIVE-19154:

Looks like the TestTriggersWorkloadManager may be happening on other ptest runs 
(https://builds.apache.org/job/PreCommit-HIVE-Build/10250/testReport/). I'm 
going to commit this one

> Poll notification events to invalidate the results cache
> --------------------------------------------------------
>                 Key: HIVE-19154
>                 URL: https://issues.apache.org/jira/browse/HIVE-19154
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>            Priority: Major
>         Attachments: HIVE-19154.1.patch, HIVE-19154.2.patch, 
> HIVE-19154.3.patch
> Related to the work for HIVE-18609. HIVE-18609 will only invalidate entries 
> in the cache if that query looked up again, which could potentially leave a 
> lot of undetected invalid entries in the cache taking up space which could 
> cause other entries to be evicted. To remove these entries in a more timely 
> fashion, have a background thread to periodically check the notification 
> events for updates to the tables used in the results cache.

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