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Posted to issues@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2015/08/31 07:42:46 UTC

[jira] [Created] (KYLIN-980) FactDistinctColumnsJob need be optimized to support high cardinality columns

Shaofeng SHI created KYLIN-980:
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             Summary: FactDistinctColumnsJob need be optimized to support high cardinality columns
                 Key: KYLIN-980
                 URL: https://issues.apache.org/jira/browse/KYLIN-980
             Project: Kylin
          Issue Type: Improvement
    Affects Versions: v0.7.2
            Reporter: Shaofeng SHI
            Assignee: Shaofeng SHI


In FactDistinctColumnsJob's combiner and reducer, it uses a HashSet to remove the duplicated values; But if a column's cardinality is very big, say > 10 Million, it may reports OutOfMemory error;

It should be enhanced to support such case.



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