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Posted to issues-all@impala.apache.org by "Tamas Mate (Jira)" <ji...@apache.org> on 2022/04/14 10:19:00 UTC

[jira] [Commented] (IMPALA-10803) Switch default data cache eviction policy to LIRS

    [ https://issues.apache.org/jira/browse/IMPALA-10803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17522220#comment-17522220 ] 

Tamas Mate commented on IMPALA-10803:
-------------------------------------

[~joemcdonnell], I see this is targeted for 4.1.0, do you think we should do it before release?

> Switch default data cache eviction policy to LIRS
> -------------------------------------------------
>
>                 Key: IMPALA-10803
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10803
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 4.1.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>
> The data cache currently defaults to using LRU for the cache eviction policy. In IMPALA-8690, we added support for LIRS, a scan resistant eviction policy. This is now stable, and we should switch to using LIRS by default. It is likely to have better performance characteristics than LRU for most workloads.



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