James Taylor commented on PHOENIX-4148:

Attached final patch with test and specific error code for insufficient memory 

> COUNT(DISTINCT(...)) should have a memory size limit
> ----------------------------------------------------
>                 Key: PHOENIX-4148
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4148
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Major
>             Fix For: 4.14.0
>         Attachments: 4148.txt, PHOENIX-4148_v2.patch
> I just managed to kill (hang) a region server by issuing a 
> COUNT(DISTINCT(...)) query over a column with very high cardinality (20m in 
> this case).
> This is perhaps not a useful thing to do, but Phoenix should nonetheless not 
> allow to have a server fail because of a query.
> [~jamestaylor], I see there GlobalMemoryManager, but I do not quite see how 
> I'd get a reference to one, once needs a tenant id, etc.

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