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Date: Fri, 11 Nov 2016 21:50:59 +0000 (UTC)
From: "Joe Pallas (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13019044.1478562988000.258473.1478901059048@Atlassian.JIRA>
In-Reply-To: <JIRA.13019044.1478562988000@Atlassian.JIRA>
References: <JIRA.13019044.1478562988000@Atlassian.JIRA> <JIRA.13019044.1478562988417@arcas>
Subject: [jira] [Commented] (HDFS-11118) Block Storage for HDFS
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archived-at: Fri, 11 Nov 2016 21:51:01 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15658275#comment-15658275 ] 

Joe Pallas commented on HDFS-11118:
-----------------------------------

I have the same concern about this that I have about Ozone: it's cool stuff that is useful, but I just am not convinced that it belongs in the existing HDFS service.  Like Ozone, it increases the complexity of the datanode, and the datanode already has a history of being, well, rather buggy.

I'm also frankly astonished that there's a feature branch with work being committed already without any discussion on this proposal, but maybe I just don't have a good understanding of Hadoop norms.

> Block Storage for HDFS
> ----------------------
>
>                 Key: HDFS-11118
>                 URL: https://issues.apache.org/jira/browse/HDFS-11118
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs
>            Reporter: Anu Engineer
>            Assignee: Anu Engineer
>         Attachments: cblock-proposal.pdf
>
>
> This JIRA proposes extending HDFS to provide replicated block storage capabilities using Storage Containers. This is would allow users to run unmodified programs that assume that they are running on a posix file system.
> With this extension, HDFS can be used like a block store. For example, YARN jobs could mount and use a volume at will. This is made possible by leveraging Storage Containers and will share the storage layer with Ozone and HDFS in future.
> Please see the attached design document for more details on this proposal.


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