[jira] [Assigned] (HADOOP-16721) Improve s3a rename resilience

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

     [ https://issues.apache.org/jira/browse/HADOOP-16721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran reassigned HADOOP-16721:
---------------------------------------

    Assignee: Steve Loughran

> Improve s3a rename resilience
> -----------------------------
>
>                 Key: HADOOP-16721
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16721
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>
> the classic \{[rename(source, dest)}} operation returns \{{false}} on certain failures, which, while somewhat consistent with the posix APIs, turns out to be useless for identifying the cause of problems. Applications tend to have code which goes
> {code}
> if (!fs.rename(src, dest)) throw new IOException("rename failed");
> {code}
> While ultimately the rename/3 call needs to be made public (HADOOP-11452) it would then need a adoption across applications. We can do this in the hadoop modules, but for Hive, Spark etc it will take along time.
> Proposed: a switch to tell S3A to stop downgrading certain failures (source is dir, dest is file, src==dest, etc) into "false". This can be turned on when trying to diagnose why things like Hive are failing.
> Production code: trivial 
> * change in rename(), 
> * new option
> * docs.
> Test code: 
> * need to clear this option for rename contract tests
> * need to create a new FS with this set to verify the various failure modes trigger it.
>  
> If this works we should do the same for ABFS, GCS. Hey, maybe even HDFS



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