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https://issues.apache.org/jira/browse/HADOOP-17414?focusedWorklogId=531997&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-531997
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ASF GitHub Bot logged work on HADOOP-17414:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 06/Jan/21 17:21
Start Date: 06/Jan/21 17:21
Worklog Time Spent: 10m
Work Description: sunchao commented on pull request #2530:
URL: https://github.com/apache/hadoop/pull/2530#issuecomment-755439979
> @sunchao @liuml07 could either of you take a look @ this?
Yes I can help on this PR, sorry for the delay. Will spend some time this
week.
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Issue Time Tracking
-------------------
Worklog Id: (was: 531997)
Time Spent: 3h 50m (was: 3h 40m)
> 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: 3h 50m
> 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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