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Posted to dev@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2015/10/12 07:41:05 UTC

[jira] [Created] (KYLIN-1068) Optimize the memory footprint for TopN counter

Shaofeng SHI created KYLIN-1068:
-----------------------------------

             Summary: Optimize the memory footprint for TopN counter
                 Key: KYLIN-1068
                 URL: https://issues.apache.org/jira/browse/KYLIN-1068
             Project: Kylin
          Issue Type: Improvement
          Components: Job Engine
    Affects Versions: v2.0
            Reporter: Shaofeng SHI
            Assignee: Shaofeng SHI
             Fix For: v2.0


The TopN implementation in StreamSummary is not perfect for Kylin, as Kylin use a Double typed counter; In a big data scenario, the possibility of multiple key having the same double counter is very low, so the data structure may not be memory economic;



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