[jira] [Resolved] (HADOOP-19161) S3A: option "fs.s3a.performance.flags" to take list of performance flags

["Steve Loughran (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-19161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-19161.
-------------------------------------
    Fix Version/s: 3.5.0
                   3.4.1
       Resolution: Fixed

> S3A: option "fs.s3a.performance.flags" to take list of performance flags
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-19161
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19161
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3
>    Affects Versions: 3.4.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.5.0, 3.4.1
>
>
> HADOOP-19072 shows we want to add more optimisations than that of HADOOP-18930.
> * Extending the new optimisations to the existing option is brittle
> * Adding explicit options for each feature gets complext fast.
> Proposed
> * A new class S3APerformanceFlags keeps all the flags
> * it build this from a string[] of values, which can be extracted from getConf(),
> * and it can also support a "*" option to mean "everything"
> * this class can also be handed off to hasPathCapability() and do the right thing.
> Proposed optimisations
> * create file (we will hook up HADOOP-18930)
> * mkdir (HADOOP-19072)
> * delete (probe for parent path)
> * rename (probe for source path)
> We could think of more, with different names, later.
> The goal is make it possible to strip out every HTTP request we do for safety/posix compliance, so applications have the option of turning off what they don't need.



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