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https://issues.apache.org/jira/browse/HDFS-8401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551193#comment-14551193
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Colin Patrick McCabe commented on HDFS-8401:
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Hi [~aagarwal],
I'm not sure I see the advantage of having a separate file system, rather than
simply putting this into HDFS. Can you clarify how users would interact with
this system? How does this relate to DDM?
> Memfs - a layered file system for in-memory storage in HDFS
> -----------------------------------------------------------
>
> Key: HDFS-8401
> URL: https://issues.apache.org/jira/browse/HDFS-8401
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
>
> We propose creating a layered filesystem that can provide in-memory storage
> using existing features within HDFS. memfs will use lazy persist writes
> introduced by HDFS-6581. For reads, memfs can use the Centralized Cache
> Management feature introduced in HDFS-4949 to load hot data to memory.
> Paths in memfs and hdfs will correspond 1:1 so memfs will require no
> additional metadata and it can be implemented entirely as a client-side
> library.
> The advantage of a layered file system is that it requires little or no
> changes to existing applications. e.g. Applications can use something like
> {{memfs://}} instead of {{hdfs://}} for files targeted to memory storage.
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