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https://issues.apache.org/jira/browse/HADOOP-16759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021329#comment-17021329
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Mingliang Liu commented on HADOOP-16759:
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That makes sense. 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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