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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/11/17 21:11:00 UTC

[jira] [Assigned] (IMPALA-6311) Evaluate smaller FPP for Bloom filters

     [ https://issues.apache.org/jira/browse/IMPALA-6311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong reassigned IMPALA-6311:
-------------------------------------

    Assignee: Riza Suminto

> Evaluate smaller FPP for Bloom filters
> --------------------------------------
>
>                 Key: IMPALA-6311
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6311
>             Project: IMPALA
>          Issue Type: Task
>          Components: Perf Investigation
>            Reporter: Jim Apple
>            Assignee: Riza Suminto
>            Priority: Major
>
> The Bloom filters are created by estimating the NDV and then using the FPP of 75% to get the right size for the filter. This is may be too high to be very useful - if our filters are currently filtering more than 75% out, then it is only because we are overestimating NDV.



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