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https://issues.apache.org/jira/browse/HDFS-15289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17214628#comment-17214628
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Junfan Zhang commented on HDFS-15289:
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Hi [~umamaheswararao] Thanks your post. We have also implemented a similar file
system and have already applied it online to solve the problems of multi-cloud
architecture and cluster migration . What I want to know is: Does
{{ViewFSOverloadScheme}} support the mounting of different cluster paths?
> Allow viewfs mounts with HDFS/HCFS scheme and centralized mount table
> ---------------------------------------------------------------------
>
> Key: HDFS-15289
> URL: https://issues.apache.org/jira/browse/HDFS-15289
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: fs
> Affects Versions: 3.2.0
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Priority: Major
> Attachments: ViewFSOverloadScheme - V1.0.pdf, ViewFSOverloadScheme.png
>
>
> ViewFS provides flexibility to mount different filesystem types with mount
> points configuration table. This approach is solving the scalability
> problems, but users need to reconfigure the filesystem to ViewFS and to its
> scheme. This will be problematic in the case of paths persisted in meta
> stores, ex: Hive. In systems like Hive, it will store uris in meta store. So,
> changing the file system scheme will create a burden to upgrade/recreate meta
> stores. In our experience many users are not ready to change that.
> Router based federation is another implementation to provide coordinated
> mount points for HDFS federation clusters. Even though this provides
> flexibility to handle mount points easily, this will not allow
> other(non-HDFS) file systems to mount. So, this does not solve the purpose
> when users want to mount external(non-HDFS) filesystems.
> So, the problem here is: Even though many users want to adapt to the scalable
> fs options available, technical challenges of changing schemes (ex: in meta
> stores) in deployments are obstructing them.
> So, we propose to allow hdfs scheme in ViewFS like client side mount system
> and provision user to create mount links without changing URI paths.
> I will upload detailed design doc shortly.
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