genericqa commented on HDFS-7240:

(!) A patch to the testing environment has been detected. 
Re-executing against the patched versions to perform further tests. 
The console is at 
https://builds.apache.org/job/PreCommit-HDFS-Build/23904/console in case of 

> 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, HDFS-7240.007.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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