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https://issues.apache.org/jira/browse/HADOOP-17979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17441808#comment-17441808
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Steve Loughran commented on HADOOP-17979:
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once this is in MAPREDUCE-7341 will use it to recover from failures, with the
recovery helper of HADOOP-17981
> Interface EtagSource to allow FileStatus subclasses to provide etags
> --------------------------------------------------------------------
>
> Key: HADOOP-17979
> URL: https://issues.apache.org/jira/browse/HADOOP-17979
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, fs/azure, fs/s3
> Affects Versions: 3.3.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Various objects stores provide etags in their FileStatus implementations
> Make these values accessible
> * new interface {{EtagFromFileStatus}} to be implemented when provided
> * filesystem.md to declare requirements of etags (constant between LIST and
> HEAD)...
> * path capabilities for (a) etag and (b) etags consistent across rename
> Add implementation for abfs, later s3a (and google gcs)
> This is initially to handle recovery from certain failures in job commit
> against abfs, but it would allow a cloud-ready version of distcp to track
> etags of uploaded files, so diff properly.
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