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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7240) Object store in HDFS
Date Tue, 19 Dec 2017 21:31:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16297454#comment-16297454
] 

Sanjay Radia commented on HDFS-7240:
------------------------------------

One of issues raised is that connecting the NN to the new block-container layer will be very
difficult because removing the FSN/BM lock is challenging.
I have attached a doc [Evolving NN using new block container layer|https://issues.apache.org/jira/secure/attachment/12902931/Evolving%20NN%20using%20new%20block-container%20layer.pdf]
to  HDFS-10419 that describes 2 milestones for connecting the NN to the new block-container
layer. The first one does *not* require removing the FSN/BM lock and still gives close to
2x scalability because the block map (which becomes the container map) is reduced significantly.

I would still like to also point out (as stated above) and in the doc that the new block-container
layer keeps a consistent state using Raft and hence eliminates the coupling between the namespace
layer and block layer and that the 2nd milestone of removing the FSN/BM lock is much easier
with the new block layer. If you disagree with my lock argument, then the first milestone
get good scalability without removing the lock.

> Object store in HDFS
> --------------------
>
>                 Key: HDFS-7240
>                 URL: https://issues.apache.org/jira/browse/HDFS-7240
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>         Attachments: HDFS Scalability and Ozone.pdf, HDFS-7240.001.patch, HDFS-7240.002.patch,
HDFS-7240.003.patch, HDFS-7240.003.patch, HDFS-7240.004.patch, HDFS-7240.005.patch, HDFS-7240.006.patch,
MeetingMinutes.pdf, Ozone-architecture-v1.pdf, Ozonedesignupdate.pdf, ozone_user_v0.pdf
>
>
> This jira proposes to add object store capabilities into HDFS. 
> As part of the federation work (HDFS-1052) we separated block storage as a generic storage
layer. Using the Block Pool abstraction, new kinds of namespaces can be built on top of the
storage layer i.e. datanodes.
> In this jira I will explore building an object store using the datanode storage, but
independent of namespace metadata.
> I will soon update with a detailed design document.



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