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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7240) Scaling HDFS
Date Thu, 22 Feb 2018 23:30:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373673#comment-16373673

Konstantin Shvachko commented on HDFS-7240:

Hey [~anu], read the security document. It's a good one, thanks. Had a question if public-private
key replacement of a current use of secrets for block tokens will require a KMS for key management.
Thought we can discuss security in a separate jira.

> Scaling 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
>            Priority: Major
>         Attachments: HDFS Scalability and Ozone.pdf, HDFS Scalability-v2.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, HadoopStorageLayerSecurity.pdf, MeetingMinutes.pdf, Ozone-architecture-v1.pdf,
Ozonedesignupdate.pdf, ozone_user_v0.pdf
> [^HDFS Scalability-v2.pdf] describes areas where HDFS does well and its scaling challenges
and how to address those challenges. Scaling HDFS requires scaling the namespace layer and
also the block layer. _This jira provides a new block layer,  Hadoop Distributed Storage
Layer (HDSL), that scales the block layer by grouping blocks into containers thereby reducing
the block-to-location map and also reducing the number of block reports and their processing_
> _A scalable namespace can be put on top this scalable block layer:_
>  * _HDFS-10419 describes how the existing NN can be modified to use the new block layer._
>  * _HDFS-13074  also provides, as an_ *_interim_* _step; a scalable flat Key-Value namespace
 on top of the new block layer; while it does not provide the HDFS API, it does support the
Hadoop FS APIs (Hadoop FileSystem, FileContext)._
> Old Description
> 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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