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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8401) Memfs - a layered file system for in-memory storage in HDFS
Date Tue, 19 May 2015 20:49:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551193#comment-14551193
] 

Colin Patrick McCabe commented on HDFS-8401:
--------------------------------------------

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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