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https://issues.apache.org/jira/browse/HDDS-6321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-6321:
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Labels: pull-request-available (was: )
> Avoid refresh pipeline for key lookup in checkAcls
> --------------------------------------------------
>
> Key: HDDS-6321
> URL: https://issues.apache.org/jira/browse/HDDS-6321
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Manager
> Affects Versions: 1.2.0
> Environment: OM setup with Native Ozone Authorizer
> Reporter: UENISHI Kota
> Assignee: Attila Doroszlai
> Priority: Major
> Labels: pull-request-available
> Attachments: 29843180-8924-11ec-8ad5-5b5a8342f2d3.png,
> 2b4df500-8924-11ec-927a-de3d8adc6fe0.png, Screenshot_2022-02-15_17-35-18.png
>
>
> In every ACL check under native Ozone authorizer, it calls
> [keyManager.checkAccess|#L162]. KeyManagerImpl#checkAccess [calls
> getFileStatus() as
> well|https://github.com/apache/ozone/blob/76aa27e7c05196ae00cba540efce4bb7529e5d15/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java#L1804],
> which finally [calls pipeline refresh()|#L2011]. Pipeline refresh is not
> needed here because it just obtains key ACL and no need for blocks. This
> causes additional external RPC call to SCM, which is unnecessary overhead on
> each object-get.
> We observed this issue in our production cluster, as 50% increase of latency
> estimated from wall clock profile:
> !Screenshot_2022-02-15_17-35-18.png|width=739,height=452!
> Also, our monitoring shows 2x lookup key to OM, which increases SCM call
> count of GetContainerWithPipeline.
> !29843180-8924-11ec-8ad5-5b5a8342f2d3.png|width=797,height=245!
> !2b4df500-8924-11ec-927a-de3d8adc6fe0.png|width=798,height=239!
>
> I'm not sure how to fix this issue regarding {color:#6e7781}HDDS-3658{color}
> . Cleanest way would be re-utilizing again refreshPipeline flag, but it'd be
> a hustle to consider all cases using getFileStatus(). HDDS-5450 may be give
> us some hints.
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