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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2017/06/29 20:03:00 UTC

[jira] [Assigned] (HIVE-16992) LLAP: better default lambda for LRFU policy

     [ https://issues.apache.org/jira/browse/HIVE-16992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V reassigned HIVE-16992:
------------------------------

    Assignee: Gopal V

> LLAP: better default lambda for LRFU policy
> -------------------------------------------
>
>                 Key: HIVE-16992
>                 URL: https://issues.apache.org/jira/browse/HIVE-16992
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Gopal V
>
> LRFU is currently skewed heavily towards LRU; there are 10k-s or 100k-s of buffers tracked during a typical workload, but the heap size is around 700. We should see if making it closer to LFU (by tweaking the lambda) will improve hit rate with small queries infrequently interleaved with large scans; and whether it will have negative effects due to perf overhead.



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