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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15229) Add FileSystem builder-based openFile() API to match createFile()
Date Thu, 20 Dec 2018 23:20:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16726307#comment-16726307
] 

Aaron Fabbri commented on HADOOP-15229:
---------------------------------------

Finished the rest of the v14 diff. Looks good overall. I only have small nits (above), nothing
major.

Documentation is thorough and clear. I ran all the integration tests in US West 2.  On a
fresh development box I see this:
{noformat}
Running org.apache.hadoop.fs.s3a.ITestS3ATemporaryCredentials
[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 8.468 s <<<
FAILURE! - in org.apache.hadoop.fs.s3a.ITestS3ATemporaryCredentials
[ERROR] testSTS(org.apache.hadoop.fs.s3a.ITestS3ATemporaryCredentials) Time elapsed: 7.973
s <<< ERROR!
com.amazonaws.SdkClientException: Unable to find a region via the region provider chain. Must
provide an explicit region in the builder or setup environment to supply a region.
at org.apache.hadoop.fs.s3a.ITestS3ATemporaryCredentials.testSTS(ITestS3ATemporaryCredentials.java:90)
{noformat}

As well as some FS Closed IO exceptions (HADOOP-15819).

> Add FileSystem builder-based openFile() API to match createFile()
> -----------------------------------------------------------------
>
>                 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: 3.0.0
>            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
>
>
> 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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