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From Todd Lipcon <t...@cloudera.com>
Subject Re: [VOTE] Merge HDFS-5698 Use protobuf to serialize / deserialize FSImage to trunk
Date Thu, 30 Jan 2014 23:18:53 GMT
One question - what's the intention with this work with regard to branch-2?
Do you plan to merge it to branch-2, and if so, are you thinking for 2.4 or

I'm a little afraid of the divergence between trunk and branch-2 in this
area, since we'll likely want to add new features which require
serialization changes. With the divergent code, we'll need to add them in
trunk in PB form, and in branch-2 in "Writable" form. Sounds like a big
pain for any future backports unless we merge.


On Thu, Jan 30, 2014 at 2:37 PM, Haohui Mai <hmai@hortonworks.com> wrote:

> Hello all,
> I would like to call a vote to merge of the new protobuf-based FSImage into
> trunk.
> The changes introduce a protobuf-based FSImage format into HDFS. It
> separates the responsibility of serializing and reconstructing the
> namespace in the NameNode using Google's Protocol Buffers
> (protobuf). The new FSImage delegates much parts of the serialization /
> deserialization logics to the protobuf side. It is also designed to
> improve the supports for compatibility and interoperability.
> The development has been done in a separate branch:
> https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5698
> The design document is available at:
> https://issues.apache.org/jira/secure/attachment/12626179/HDFS-5698-design.pdf
> The HDFS-5698 jira tracks the development of the feature.
> The feature changes no public APIs. The existing tests include both
> unit tests and end-to-end tests. They have already covered this
> feature.
> Once the feature is merged into trunk, we will continue to test and
> fix any bugs that may be found on trunk.
> The bulk of the design and implementation was done by Jing Zhao,
> Suresh Srinivas and me. Thanks Kihwal Lee, Todd Lipcon, Colin
> Patrick McCabe, Chris Nauroth, and Daryn Sharp for providing feedback on
> the jiras and in discussions.
> This vote runs for a week and closes on 2/6/2013 at 11:59 pm PT.
> Regards,
> Haohui
> --
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Todd Lipcon
Software Engineer, Cloudera

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