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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16992) LLAP: better default lambda for LRFU policy
Date Thu, 29 Jun 2017 20:03:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068893#comment-16068893
] 

Gopal V commented on HIVE-16992:
--------------------------------

I'll run a matrix of tests and see if we can have a better default. 

> 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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