[jira] [Resolved] (HADOOP-16759) Filesystem openFile() builder to take a FileStatus param

["Mingliang Liu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mingliang Liu resolved HADOOP-16759.
------------------------------------
    Fix Version/s: 3.3.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

Committed to {{trunk}} branch. I see major conflicts when backporting to 3.2. [~stevel@apache.org] Do you plan to bulk backport some time later those patches which apply, or you upload a new patch for branch-3.2/3.1? Thanks!

> Filesystem openFile() builder to take a FileStatus param
> --------------------------------------------------------
>
>                 Key: HADOOP-16759
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16759
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs, fs/azure, fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 3.3.0
>
>
> Let us pass in a file status to openFile() so that S3A  & ABFS will skip their own HEAD requests just to see if a file is there, a normal file and get its length + etag, 
> {code}
>     CompletableFuture<FSDataInputStream> streamF = fs.openFile(stat.getPath())
>       .withFileStatus(stat).build()
> {code}
> code opening files off a listing of everything in a directory can eliminate a lot of requests here.
> Also: change the specification of openFile's completable future to say "returned stream may only raise FNFE, access restrictions on the first read"
> That is: it's not just potentially an async open, it's possibly lazy evaluated entirely. 



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