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

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

Steve Loughran created HADOOP-16759:
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             Summary: 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


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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