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https://issues.apache.org/jira/browse/HADOOP-16202?focusedWorklogId=538736&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-538736
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ASF GitHub Bot logged work on HADOOP-16202:
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Author: ASF GitHub Bot
Created on: 20/Jan/21 22:30
Start Date: 20/Jan/21 22:30
Worklog Time Spent: 10m
Work Description: steveloughran commented on pull request #2584:
URL: https://github.com/apache/hadoop/pull/2584#issuecomment-763994374
correct.
must() == raise an error if not recognised.
opt() entirely optional
note that createFile() has the same api/rules/ common builder codebase. i
hope to add some options there for the stores to say "skip all probes for paths
existing, being a dir, having a parent..." goal is max performance writes on
paths where the writer knows it is building up a dir tree from scratch, or
using unique names. in particular: flink/spark checkpoints
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Issue Time Tracking
-------------------
Worklog Id: (was: 538736)
Time Spent: 8h 40m (was: 8.5h)
> 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: 8h 40m
> 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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