[jira] [Work started] (HADOOP-16493) S3AFilesystem.initiateRename() can skip check on dest.parent status if src has same parent

["Steve Loughran (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HADOOP-16493 started by Steve Loughran.
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> S3AFilesystem.initiateRename() can skip check on dest.parent status if src has same parent
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-16493
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16493
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>
> Speedup inferred from debug logs (probably not a regression from HADOOP-15183, more something we'd not noticed).
> There's a check in {{initiateRename()}} to make sure the parent dir of the dest exists. 
> If dest.getParent() is  src.getParent() (i.e. a same dire rename) or is any other ancestor, we don't need those HEAD/LIST requests. 



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