[jira] [Work logged] (HADOOP-16202) Stabilize openFile() and adopt internally

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16202?focusedWorklogId=545505&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-545505 ]

ASF GitHub Bot logged work on HADOOP-16202:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Feb/21 18:40
            Start Date: 01/Feb/21 18:40
    Worklog Time Spent: 10m 
      Work Description: steveloughran commented on pull request #2584:
URL: https://github.com/apache/hadoop/pull/2584#issuecomment-771070179


   rebased to fix compile problems; the final patch is the one with changes since Thomas's last review
   
   * move all the text on options into the fsdatainputstreambuilder.md file
   * try to define the validation of must/opt in pseudo-python
   * make sure the doc is consistent in saying FNFE and permission issues MUST be delayed until future.get() and MAY be delayed until the first actual read.  This is to give object stores the maximum time for async probes. Example: you could initiate a HEAD request in  build() but not block for its completion until read()
   
   S3A added some extra tuning of the input stream/openFile logic, so the stream no longer gets access to the S3 client, simply callbacks
   
   Testing: in progress


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 545505)
    Time Spent: 9h 20m  (was: 9h 10m)

> Stabilize openFile() and adopt internally
> -----------------------------------------
>
>                 Key: HADOOP-16202
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16202
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          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: 9h 20m
>  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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