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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4148) COUNT(DISTINCT(...)) should have a memory size limit
Date Wed, 07 Mar 2018 21:43:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390289#comment-16390289
] 

James Taylor commented on PHOENIX-4148:
---------------------------------------

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

> 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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