[jira] [Commented] (HADOOP-16202) Enhance S3A openFile()

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

    [ https://issues.apache.org/jira/browse/HADOOP-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176938#comment-17176938 ] 

Steve Loughran commented on HADOOP-16202:
-----------------------------------------

HADOOP-17038 highlights benefit of controlling readahead -especially disabling it- on a case by case basis. Should be in this patch

> Enhance S3A openFile()
> ----------------------
>
>                 Key: HADOOP-16202
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16202
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>
> The {{openFile()}} builder API lets us add new options when reading a file
> Add an option {{"fs.s3a.open.option.length"}} which takes a long and allows the length of the file to be declared. If set, *no check for the existence of the file is issued when opening the file*
> Also: withFileStatus() to take any FileStatus implementation, rather than only S3AFileStatus -and not check that the path matches the path being opened. Needed to support viewFS-style wrapping and mounting.



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