[jira] [Commented] (HDDS-4285) Read is slow due to frequent calls to UGI.getCurrentUser() and getTokens()

["Xiaoyu Yao (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDDS-4285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211083#comment-17211083 ] 

Xiaoyu Yao commented on HDDS-4285:
----------------------------------

Thanks [~adoroszlai] for the contribution and all for the reviews. The PR has been merged.

> Read is slow due to frequent calls to UGI.getCurrentUser() and getTokens()
> --------------------------------------------------------------------------
>
>                 Key: HDDS-4285
>                 URL: https://issues.apache.org/jira/browse/HDDS-4285
>             Project: Hadoop Distributed Data Store
>          Issue Type: Improvement
>            Reporter: Marton Elek
>            Assignee: Attila Doroszlai
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.1.0
>
>         Attachments: image-2020-09-28-16-19-17-581.png, profile-20200928-161631-180518.svg
>
>
> Ozone read operation turned out to be slow mainly because we do a new UGI.getCurrentUser for block token for each of the calls.
> We need to cache the block token / UGI.getCurrentUserCall() to make it faster.
>  !image-2020-09-28-16-19-17-581.png! 
> To reproduce:
> Checkout: https://github.com/elek/hadoop-ozone/tree/mocked-read
> {code}
> cd hadoop-ozone/client
> export MAVEN_OPTS=-agentpath:/home/elek/prog/async-profiler/build/libasyncProfiler.so=start,file=/tmp/profile-%t-%p.svg
> mvn compile exec:java -Dexec.mainClass=org.apache.hadoop.ozone.client.io.TestKeyOutputStreamUnit -Dexec.classpathScope=test
> {code}



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