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Posted to issues@kudu.apache.org by "Grant Henke (JIRA)" <ji...@apache.org> on 2018/02/16 15:27:00 UTC

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

     [ https://issues.apache.org/jira/browse/KUDU-749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Henke updated KUDU-749:
-----------------------------
    Target Version/s:   (was: 1.5.0)

> 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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