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https://issues.apache.org/jira/browse/HDDS-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781945#comment-16781945
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Steve Loughran commented on HDDS-792:
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you could concat them together and serve a larger string? What is key is: if
you do serve a value, then if the string returned is the same, it means the
content at the far end hasn't changed. We're adding support (HADOOP-15625) for
checking that on an open file, and I dream of having a distcp version which
would use etags to decide whether to update files. Less of an issue for ozone
as you'd distcp direct though
> Use md5 hash as ETag for Ozone S3 objects
> -----------------------------------------
>
> Key: HDDS-792
> URL: https://issues.apache.org/jira/browse/HDDS-792
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: S3
> Reporter: Elek, Marton
> Priority: Major
>
> AWS S3 uses md5 hash of the files as ETag.
> Not a strict requirement, but s3 tests (https://github.com/gaul/s3-tests/)
> can not been executed without that.
> It requires to support custom key/value annotations on key objects.
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