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https://issues.apache.org/jira/browse/HADOOP-16202?focusedWorklogId=762814&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-762814
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ASF GitHub Bot logged work on HADOOP-16202:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 27/Apr/22 11:45
Start Date: 27/Apr/22 11:45
Worklog Time Spent: 10m
Work Description: steveloughran opened a new pull request, #4238:
URL: https://github.com/apache/hadoop/pull/4238
### Description of PR
backport of HADOOP-16202. Enhanced openFile() to branch-3.3, plus a couple
of other cherrypicks from trunk to ease the backporting.
if yetus is happy i wil merge the entire sequence in as the ordered chain of
commits
### How was this patch tested?
cloud store testing in progress against aws london and azure cardiff.
### For code changes:
- [X] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [X] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
Issue Time Tracking
-------------------
Worklog Id: (was: 762814)
Time Spent: 22h 20m (was: 22h 10m)
> 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
> Fix For: 3.4.0
>
> Time Spent: 22h 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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