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Posted to issues@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2016/01/31 09:06:39 UTC

[jira] [Created] (KYLIN-1385) Enhance FactDistinctColumnsJob to use multiple reducers

Shaofeng SHI created KYLIN-1385:
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             Summary: Enhance FactDistinctColumnsJob to use multiple reducers
                 Key: KYLIN-1385
                 URL: https://issues.apache.org/jira/browse/KYLIN-1385
             Project: Kylin
          Issue Type: Improvement
          Components: Job Engine
    Affects Versions: v1.2, v2.0
            Reporter: Shaofeng SHI
            Assignee: Shaofeng SHI
             Fix For: v2.1


So far the FactDistinctColumnsJob is using 1 reducer to merge the distinct values for all dimension columns on fact table. When there are 1 or multiple ultra high cardinality columns, it couldn't gain concurrency; It should dispatch the workload to multiple reducers.



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