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https://issues.apache.org/jira/browse/HADOOP-17981?focusedWorklogId=679541&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-679541
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ASF GitHub Bot logged work on HADOOP-17981:
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Author: ASF GitHub Bot
Created on: 10/Nov/21 10:11
Start Date: 10/Nov/21 10:11
Worklog Time Spent: 10m
Work Description: steveloughran commented on pull request #3611:
URL: https://github.com/apache/hadoop/pull/3611#issuecomment-964982131
converting this to a draft as i don't want it merged in; the etag pr and
adoption of the resilient commit helper is how I intend to do it.
* isolates the etag api and adds s3a coverage
* avoids going near FileOutputCommitter
the manifest committer is faster than rajesh's patch on object stores where
listings are slow (done during task commit), and because it doesn't rename in
task commit, is atomic even on gcs. with rate limiting we can even keep it
below the load threshold for azure storage.
and, because it doesn't touch FileOutputCommitter, safer to merge
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Issue Time Tracking
-------------------
Worklog Id: (was: 679541)
Time Spent: 12h 20m (was: 12h 10m)
> Support etag-assisted renames in FileOutputCommitter
> ----------------------------------------------------
>
> Key: HADOOP-17981
> URL: https://issues.apache.org/jira/browse/HADOOP-17981
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, fs/azure
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Time Spent: 12h 20m
> Remaining Estimate: 0h
>
> To deal with some throttling/retry issues in object stores,
> pass the FileStatus entries retrieved during listing
> into a private interface ResilientCommitByRename which filesystems
> may implement to use extra attributes in the listing (etag, version)
> to constrain and validate the operation.
> Although targeting azure, GCS and others could use. no point in S3A as they
> shouldn't use this committer.
> # And we are not going to do any changes to FileSystem as there are explicit
> guarantees of public use and stability.
> I am not going to make that change as the hive thing that will suddenly start
> expecting it to work forever.
> # I'm not planning to merge this in, as the manifest committer is going to
> include this and more (MAPREDUCE-7341)
> However, I do need to get this in on a branch, so am doing this work on trunk
> for dev & test and for others to review
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