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Posted to issues@impala.apache.org by "Jim Apple (JIRA)" <ji...@apache.org> on 2017/12/12 17:40:00 UTC

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

Jim Apple created IMPALA-6311:
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             Summary: 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


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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