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From Andrew Wang <andrew.w...@cloudera.com>
Subject Re: [VOTE] Merge HDFS-2832 Heterogeneous Storage Phase 1 to trunk
Date Fri, 06 Dec 2013 23:15:38 GMT
Hi everyone,

I'm still getting up to speed on the changes here (my fault for not
following development more closely, other priorities etc etc), but the
branch thus far is already quite impressive. It's quite an undertaking to
turn the DN into a collection of Storages, along with the corresponding
datastructure, tracking, and other changes in the NN and DN.

Correct me if I'm wrong though, but this still leaves a substantial part of
the design doc to be implemented. Looking at the list of remaining
subtasks, it seems like we still can't specify a storage type for a file
(HDFS-5229) or write a file to a given storage type (HDFS-5391), along with
the corresponding client protocol changes. This leads me to two questions:

- If this is merged, what can I do with the new code? Without client
changes or the ability to create a file on a different storage type, I
don't know how (for example) I could hand this to our QA team to test. I'm
wondering why we want to merge now rather than when the branch is more
feature complete.
- What's the plan for the implementation of the remaining features? How
many phases? What's the timeline for these phases? Particularly, related to
the use cases presented in section 2 of the design doc.

I'm also going to post some design doc questions to the JIRA, there are a
few technical q's I'd like to get clarification on.


On Wed, Dec 4, 2013 at 7:21 AM, Sirianni, Eric <Eric.Sirianni@netapp.com>wrote:

> +1
> My team has been developing and testing against the HDFS-2832 branch for
> the past month.  It has proven to be quite stable.
> Eric
> -----Original Message-----
> From: Arpit Agarwal [mailto:aagarwal@hortonworks.com]
> Sent: Monday, December 02, 2013 7:07 PM
> To: hdfs-dev@hadoop.apache.org; common-dev@hadoop.apache.org
> Subject: [VOTE] Merge HDFS-2832 Heterogeneous Storage Phase 1 to trunk
> Hello all,
> I would like to call a vote to merge phase 1 of the Heterogeneous Storage
> feature into trunk.
> *Scope of the changes:*
> The changes allow exposing the DataNode as a collection of storages and set
> the foundation for subsequent work to present Heterogeneous Storages to
> applications. This allows DataNodes to send block and storage reports
> per-storage. In addition this change introduces the ability to add a
> 'storage type' tag to the storage directories. This enables supporting
> different types of storages in addition to disk storage.
> Development of the feature is tracked in the jira
> https://issues.apache.org/jira/browse/HDFS-2832.
> *Details of development and testing:*
> Development has been done in a separate branch -
> https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2832. The
> updated design is posted at -
> https://issues.apache.org/jira/secure/attachment/12615761/20131125-HeterogeneousStorage.pdf
> .
> The changes involve ~6K changed lines of code, with a third of those
> changes being to tests.
> Please see the test plan
> https://issues.apache.org/jira/secure/attachment/12616642/20131202-HeterogeneousStorage-TestPlan.pdffor
> the details. Once the feature is
> merged into trunk, we will continue to test and fix any bugs that may be
> found on trunk as well as add further tests as outlined in the test plan.
> The bulk of the design and implementation was done by Suresh Srinivas,
> Sanjay Radia, Nicholas Sze, Junping Du and me. Also, thanks to Eric
> Sirianni, Chris Nauroth, Steve Loughran, Bikas Saha, Andrew Wang and Todd
> Lipcon for providing feedback on the Jiras and in discussions.
> This vote runs for a week and closes on 12/9/2013 at 11:59 pm PT.
> Thanks,
> Arpit
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