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