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Posted to issues@kylin.apache.org by "Shaofeng SHI (JIRA)" <ji...@apache.org> on 2015/11/06 09:51:27 UTC

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

     [ https://issues.apache.org/jira/browse/KYLIN-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shaofeng SHI resolved KYLIN-1068.
---------------------------------
    Resolution: Fixed

The enhancement has been done and merged back to 2.x-staging branch.

> 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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