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https://issues.apache.org/jira/browse/HADOOP-17414?focusedWorklogId=541055&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-541055
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ASF GitHub Bot logged work on HADOOP-17414:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Jan/21 13:15
Start Date: 25/Jan/21 13:15
Worklog Time Spent: 10m
Work Description: steveloughran commented on pull request #2530:
URL: https://github.com/apache/hadoop/pull/2530#issuecomment-766807576
Revert the switching of the fs.s3a.magic.enabled; got a bigger patch which
removes that switch entirely; it was only ever in there for two concerns
1. to make sure people were really, really confident their store was good to
go
1. in case it turned out that something was using `__magic` as prefix and
the committer went and broke everything
issue 1 is now resolved, and if issue 2 ever surfaced, well, nobody filed a
bug report.
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Issue Time Tracking
-------------------
Worklog Id: (was: 541055)
Time Spent: 9h 40m (was: 9.5h)
> 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
> Time Spent: 9h 40m
> 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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