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From "Aaron T. Myers" <...@cloudera.com>
Subject Re: [VOTE] Merge HDFS-2802 snapshot feature to trunk
Date Wed, 08 May 2013 00:29:24 GMT
I'm +1 as well on merging this branch to trunk. I've thoroughly
reviewed/discussed the design and have personally reviewed much of the code
as well. Good stuff.

I would have preferred to wrap up the discussion regarding which API should
include the snapshot create/delete operations before the merge, but I don't
think that should hold up the merge to trunk. No reason we can't discuss it
afterward, though I'd really like to come to a conclusion about that before
we merge it to branch-2. Suresh, I believe the last action on that thread
was you asking Nicholas to move the discussion to a JIRA, but I don't think
that JIRA ever got filed. Mind doing that?

Aaron T. Myers
Software Engineer, Cloudera

On Wed, May 1, 2013 at 11:54 AM, Suresh Srinivas <suresh@hortonworks.com>wrote:

> This is a follow up to my earlier heads up about merging Snapshot feature
> to trunk - http://markmail.org/message/ixkyku2cebkewnzy. I am happy to
> announce that we have completed the development of the feature. It is ready
> to be merged into trunk.
> Development of snapshot feature is tracked in the jira
> https://issues.apache.org/jira/browse/HDFS-2802. This is an important
> feature for HDFS. Please see a brief presentation that describes the
> feature at a highlevel from the Snapshot discussion meetup we had a while
> back -
> https://issues.apache.org/jira/secure/attachment/12552861/Snapshots.pdf.
> Details of development and testing:
> Development has been done in a separate branch -
> https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802. The
> updated design is posted at -
> https://issues.apache.org/jira/secure/attachment/12581376/Snapshots20120429.pdf
> .
> The feature development has involved close to 120 subtasks and close to 25K
> lines of code.
> A lot of unit tests have been added as a part of the feature. We also have
> been testing this in a cluster of 5 nodes with a long running test that
> mimics a real cluster usage with emphasis on use cases related to snapshot.
>  We are also testing non-snapshot code path running tests on a separate
> cluster without configuring snapshot. Please see the test plan
> https://issues.apache.org/jira/secure/attachment/12575442/snapshot-testplan.pdf
> for
> the details. Once the feature is merged into trunk, we will continue to
> test and fix any bugs that may be found on the trunk.
> This feature is a result of many people's collaboration. The bulk of the
> code and design work was done by Nicholas Sze, Jing Zhao, Hari Mankude,
> Brandon Li,  Aprit Agarwal, Sanjay Radia and me. Thanks to Ramya Sunil for
> doing feature testing and finding many bugs. Aaron Myers, Konstantin
> Shvachko, Allen Wittenauer, Chris Nauroth, Todd Lipcon, Michael Stack, Eli
> Collins, Lars Hofhansl
>  and many others contributed to the feature definition, design and code
> reviews on the jiras and during meetup.
> This vote runs for a week and closes on 5/8/2013 at 12:00 pm. Here is my +1
> for the merge.
> Regards,
> Suresh

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