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https://issues.apache.org/jira/browse/HDDS-7585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17655123#comment-17655123
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Attila Doroszlai commented on HDDS-7585:
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bq. How about this simple solution ... convert underscore to "-" in any bucket 
access

# If I create a bucket named {{x_y-z}} and then list buckets, how does Ozone 
know which {{-}} to convert back to {{_}}?  Or is it OK to get back different 
bucket name?
# If "posix.compliant" is enabled, will Ozone reject creation of {{x-y-z}} with 
"already exists" if there is a bucket named {{x_y-z}}?

> Allow Ozone bucket to use non-S3-compliance naming rule
> -------------------------------------------------------
>
>                 Key: HDDS-7585
>                 URL: https://issues.apache.org/jira/browse/HDDS-7585
>             Project: Apache Ozone
>          Issue Type: Improvement
>          Components: Ozone CLI, Ozone Filesystem, Ozone Manager
>            Reporter: Dave Teng
>            Priority: Major
>
> We notice many HDFS migration cases which translate the second level 
> directory names to Ozone bucket names.
> However, some characters in the name of directory are +compliant with POSIX+ 
> convention, but are +not compliant with S3+ naming rule, such as 
> {*}underscore{*}.
> Thus the original HDFS path which contains *underscore* _character are not 
> allowed to put into Ozone because by default Ozone's path validation is same 
> as S3. For such users, this proposal wish to provide a way that when the user 
> gives a flag while creating the bucket via Ozone CLI (not from S3 interface), 
> Ozone will allow *underscore*_ only for such buckets. The idea is it'd be 
> user's choice whether to create a non-s3 compliant bucket path or not.  Ozone 
> will keep equally supporting both OFS and S3 interfaces. For pure file system 
> back ground users, they may want to go ahead with this flag by having the 
> awareness of that they may not be able to access the bucket through S3 
> interface.
>  
> This Jira is an umbrella ticket that makes Ozone compatible with these two 
> types of naming convention, both POSIX and S3, to enable the HDFS to Ozone 
> migration with non s3 compliant paths.
>  
> (ps:
>  - This proposal wouldn't change the default behavior of S3 bucket naming 
> semantic in Ozone.
>  - The documentation for new flag will be provided! )
>  



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