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Posted to issues@kylin.apache.org by "kangkaisen (JIRA)" <ji...@apache.org> on 2017/07/27 14:02:00 UTC

[jira] [Created] (KYLIN-2764) Build the dict for UHC column with MR

kangkaisen created KYLIN-2764:
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             Summary: Build the dict for UHC column with MR
                 Key: KYLIN-2764
                 URL: https://issues.apache.org/jira/browse/KYLIN-2764
             Project: Kylin
          Issue Type: Improvement
          Components: Job Engine
    Affects Versions: v2.0.0
            Reporter: kangkaisen
            Assignee: kangkaisen


KYLIN-2217 has built dict for  normal column with MR,  but the UHC column still build dict in JobServer. Like KYLIN-2217, we also could use MR build dict for UHC column. which could thoroughly release the memory pressure and  improve job concurrent for JobServer  as well as speed up multi UHC columns procedure.

The MR input is the output of  "Extract Fact Table Distinct Columns", the MR output is the UHC column dict. Because it is very hard build global dict with multi reducers, I use one reducer handle one UHC column and allocate enough memory to the reducer. According to my test, 8G memory is enough.



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