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https://issues.apache.org/jira/browse/HDDS-16658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-16658.
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    Fix Version/s: 2.3.0
       Resolution: Implemented

> Reuse source key details when opening the input stream in S3 CopyObject
> -----------------------------------------------------------------------
>
>                 Key: HDDS-16658
>                 URL: https://issues.apache.org/jira/browse/HDDS-16658
>             Project: Apache Ozone
>          Issue Type: Sub-task
>            Reporter: Huang Kuan Hao
>            Assignee: Huang Kuan Hao
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.3.0
>
>
> ObjectEndpoint#copyObject retrieves the source key details to evaluate copy 
> conditions and obtain the object's size, metadata, tags, and ETag. When 
> copying the content, it then calls ClientProtocol#getKey, which issues 
> another GetKeyInfo RPC for the same source key. Open the input stream through 
> OzoneKeyDetails#getContent instead, reusing the key information already 
> fetched. This follows the approach used by GetObject and UploadPartCopy and 
> saves one source metadata RPC on the normal content-copy path. Retain the 
> existing GetObject action scope, copy-condition checks, and input-stream 
> retry handling.
>   Regression tests should verify:
>   * Source key details are fetched once, without a separate getKey call, for 
> both regular and datastream copies.
>   * Copied content, metadata, tags, ETag, and LastModified remain correct.
>   * Existing source and destination conditions and expected-owner checks are 
> preserved.



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