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Posted to issues@kudu.apache.org by "Paul Brannan (JIRA)" <ji...@apache.org> on 2018/04/03 16:22:00 UTC

[jira] [Commented] (KUDU-749) Improve performance for zipfian update

    [ https://issues.apache.org/jira/browse/KUDU-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424240#comment-16424240 ] 

Paul Brannan commented on KUDU-749:
-----------------------------------

My mistake; it was the apply thread, not the MaintenanceManager.

> Improve performance for zipfian update
> --------------------------------------
>
>                 Key: KUDU-749
>                 URL: https://issues.apache.org/jira/browse/KUDU-749
>             Project: Kudu
>          Issue Type: Improvement
>          Components: perf, tablet
>    Affects Versions: Private Beta
>            Reporter: Todd Lipcon
>            Priority: Major
>         Attachments: screenshot-1.png, screenshot-2.png
>
>
> A zipfian 50/50 update/read workload on YCSB gets slower and slower until it's pretty intolerable (random reads taking 100+ms of CPU). It seems like all the CPU is spent in DMSIterator::PrepareBatch. We're probably doing something dumb here - let's look for some low hanging fruit to fix this.



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