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https://issues.apache.org/jira/browse/HADOOP-15229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760038#comment-16760038
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Steve Loughran commented on HADOOP-15229:
-----------------------------------------

(I should add: I'm going w./ Aaron's +1 & everyone else being happy, so after 
this yetus run it's going in, this goes in)

> Add FileSystem builder-based openFile() API to match createFile() + S3 Select
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-15229
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15229
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs, fs/azure, fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15229-001.patch, HADOOP-15229-002.patch, 
> HADOOP-15229-003.patch, HADOOP-15229-004.patch, HADOOP-15229-004.patch, 
> HADOOP-15229-005.patch, HADOOP-15229-006.patch, HADOOP-15229-007.patch, 
> HADOOP-15229-009.patch, HADOOP-15229-010.patch, HADOOP-15229-011.patch, 
> HADOOP-15229-012.patch, HADOOP-15229-013.patch, HADOOP-15229-014.patch, 
> HADOOP-15229-015.patch, HADOOP-15229-016.patch, HADOOP-15229-017.patch, 
> HADOOP-15229-018.patch, HADOOP-15229-019.patch, HADOOP-15229-020.patch
>
>
> Replicate HDFS-1170 and HADOOP-14365 with an API to open files.
> A key requirement of this is not HDFS, it's to put in the fadvise policy for 
> working with object stores, where getting the decision to do a full GET and 
> TCP abort on seek vs smaller GETs is fundamentally different: the wrong 
> option can cost you minutes. S3A and Azure both have adaptive policies now 
> (first backward seek), but they still don't do it that well.
> Columnar formats (ORC, Parquet) should be able to say "fs.input.fadvise" 
> "random" as an option when they open files; I can imagine other options too.
> The Builder model of [~eddyxu] is the one to mimic, method for method. 
> Ideally with as much code reuse as possible



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