[jira] [Updated] (PHOENIX-4148) COUNT(DISTINCT(...)) should have a memory size limit

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated PHOENIX-4148:
-----------------------------------
    Attachment: 4148.txt

Here's the clumsy patch I mentioned.

DON'T COMMIT.

I don't like it, at the same time I cannot think of anything better.
Just parking it here for now.


> 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
>         Attachments: 4148.txt
>
>
> 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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