[jira] [Assigned] (HADOOP-17134) S3AFileSystem.listLocatedStatu(file) does a LIST even with S3Guard

["Mukund Thakur (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-17134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mukund Thakur reassigned HADOOP-17134:
--------------------------------------

    Assignee: Mukund Thakur

> S3AFileSystem.listLocatedStatu(file) does a LIST even with S3Guard
> ------------------------------------------------------------------
>
>                 Key: HADOOP-17134
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17134
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.4.0
>            Reporter: Steve Loughran
>            Assignee: Mukund Thakur
>            Priority: Minor
>
> This is minor and we may want to WONTFIX; noticed during work on directory markers.
> If you call listLocatedStatus(file) then a LIST call is always made to S3, even when S3Guard is present and has the record to say "this is a file"
> Does this matter enough to fix? 
> # The HADOOP-16465 work moved the list before falling back to getFileStatus
> # that listing calls s3guard.listChildren(path) to list the children.
> # which only returns the chlldren of a path, not a record of the path itself.
> # so we get an empty list back, triggering the LIST
> # its only after that LIST fails that we fall back to getFileStatus and hence look for the actual file record.



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