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

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

    [ https://issues.apache.org/jira/browse/HADOOP-16759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038675#comment-17038675 ] 

Hudson commented on HADOOP-16759:
---------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #17961 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/17961/])
HADOOP-16759. FileSystem Javadocs to list what breaks on API changes (github: rev a562942b05a29d29e4a4fe3df4f35e2a8e7d208d)
* (edit) hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java


> 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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