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https://issues.apache.org/jira/browse/HADOOP-9385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13597533#comment-13597533
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Luke Lu commented on HADOOP-9385:
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+1 for moving all existing external fs client support to separate jars. IMO, 
"hadoop-fs-extra" probably conveys the purpose of the project better: it's for 
external/extra fs support

Though I share the maintainability concerns, there is substantial end-user 
benefit of keeping the hadoop client code for these fs together. We can put a 
README in the project with standard disclaimers... 
                
> create hadoop-common-project/hadoop-filesystem-clients subprojects for 
> blobstore & other clients
> ------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9385
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9385
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 3.0.0
>            Reporter: Steve Loughran
>
> As discussed on hadoop-general, we need somewhere to host the non-HDFS 
> filesystem clients. S3/S3N, ftp are all in hadoop-common, with the JAR 
> dependencies there. This doesn't scale to openstack, azure, or handle changes 
> in the S3 dependencies.
> With a project of {{hadoop-common/hadoop-filesystem-clients}}, we could add 
> separate FS clients: {{hadoop-filesystem-client-aws}}, 
> {{hadoop-filesystem-client-openstack}}, etc, each with their own tests, JARs 
> and POM file dependencies. This would translate into separate bigtop 
> RPMs/JARs 

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