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Posted to dev@phoenix.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2017/09/01 05:45:00 UTC

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

Lars Hofhansl created PHOENIX-4148:
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             Summary: 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


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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