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https://issues.apache.org/jira/browse/HADOOP-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-16202:
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Description:
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
h3. this patch MUST be followed by HADOOP-18410
was:
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
> 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: Improvement
> 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, 3.3.9
>
> Time Spent: 23h 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
> h3. this patch MUST be followed by HADOOP-18410
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