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Posted to issues@kudu.apache.org by "Grant Henke (Jira)" <ji...@apache.org> on 2020/06/01 16:12:00 UTC

[jira] [Commented] (KUDU-767) Un-cached reads should not bump blocks to front of LRU list

    [ https://issues.apache.org/jira/browse/KUDU-767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121133#comment-17121133 ] 

Grant Henke commented on KUDU-767:
----------------------------------

Ah, I see. Thanks for the correction.

> Un-cached reads should not bump blocks to front of LRU list
> -----------------------------------------------------------
>
>                 Key: KUDU-767
>                 URL: https://issues.apache.org/jira/browse/KUDU-767
>             Project: Kudu
>          Issue Type: Improvement
>          Components: cfile, perf
>    Affects Versions: Private Beta
>            Reporter: Todd Lipcon
>            Priority: Major
>             Fix For: NA
>
>
> When we're doing an un-cached read like an MR job or compaction, we should probably not be moving the blocks being accessed to the front of the LRU list. Because we do, this can cause hotter blocks to get pushed down to be towards the end of the LRU after the big scan.



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