[jira] [Updated] (HADOOP-16202) Enhance openFile() for better read performance against object stores

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

     [ https://issues.apache.org/jira/browse/HADOOP-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran updated HADOOP-16202:
------------------------------------
    Summary: Enhance openFile() for better read performance against object stores   (was: Stabilize openFile() and adopt internally)

> Enhance openFile() for better read performance against object stores 
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-16202
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16202
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs, fs/s3, tools/distcp
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 16h 10m
>  Remaining Estimate: 0h
>
> 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.
> and Adopt where appropriate to stop clusters with S3A reads switched to random IO from killing download/localization
> * fs shell copyToLocal
> * distcp
> * IOUtils.copy



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