[jira] [Resolved] (HADOOP-17414) Magic committer files don't have the count of bytes written collected by spark

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

     [ https://issues.apache.org/jira/browse/HADOOP-17414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-17414.
-------------------------------------
    Fix Version/s: 3.3.1
       Resolution: Fixed

> Magic committer files don't have the count of bytes written collected by spark
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-17414
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17414
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.1
>
>          Time Spent: 12h 20m
>  Remaining Estimate: 0h
>
> The spark statistics tracking doesn't correctly assess the size of the uploaded files as it only calls getFileStatus on the zero byte objects -not the yet-to-manifest files. Which, given they don't exist yet, isn't easy to do.
> Solution: 
> * Add getXAttr and listXAttr API calls to S3AFileSystem
> * Return all S3 object headers as XAttr attributes prefixed "header." That's custom and standard (e.g header.Content-Length).
> The setXAttr call isn't implemented, so for correctness the FS doesn't
> declare its support for the API in hasPathCapability().
> The magic commit file write sets the custom header 
> set the length of the data final data in the header
> x-hadoop-s3a-magic-data-length in the marker file.
> A matching patch in Spark will look for the XAttr
> "header.x-hadoop-s3a-magic-data-length" when the file
> being probed for output data is zero byte long. 
> As a result, the job tracking statistics will report the
> bytes written but yet to be manifest.



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