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Paulo Motta commented on CASSANDRA-8928:
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LGTM, a few nits in your updated proposal:
* Update {{We will start working with ma (3.0.x) and jb (2.2.x) formats}} to ma
and la.
* Maybe add [ccm|https://github.com/pauloricardomg/ccm] tool to {{Familiarize
with Cassandra dtest suit.}}
bq. In addition, do you mean with double cycle support that our
sstabledowngrader should work correctly with a flow like "ma" -> "ka" -> "la"?
Would be something like ma -> la -> ma -> la -> ma and check the data is
correct. please note that upgrade from la -> ma is already supported via the
upgradesstables tool and you would add support to downgrade from ma -> la via
the sstabledowngrader tool. Actually {{StandaloneUpgrader}} is probably more
relevant then {{SStableScrubber}} in this context so you should mention this in
your proposal instead(although sstable scrubber is also important for learning
purposes because it validates the sstable when reading). You should also
probably have a look on {{OldFormatIterator}} and {{OldFormatDeserializer}}
classes to learn how sstables are read in the previous format during your
familiarization period.
Another thing that could possibly help in your Apache GSoC application is to
work on a [low hanging fruit
ticket|https://issues.apache.org/jira/browse/CASSANDRA-11352?jql=project%20%3D%20CASSANDRA%20AND%20status%20%3D%20Open%20AND%20labels%20%3D%20lhf]
to prove your ability to dive into a complex codebase (CASSANDRA-8888 and
CASSANDRA-8777 are probably good for beginners). Please note that this is not
required, but would only be a plus in your application to the Apache selection
committee and does not need to be done before the application deadline since
the decision will probably be taken only a few weeks after that.
> Add downgradesstables
> ---------------------
>
> Key: CASSANDRA-8928
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8928
> Project: Cassandra
> Issue Type: New Feature
> Components: Tools
> Reporter: Jeremy Hanna
> Priority: Minor
> Labels: gsoc2016, mentor
>
> As mentioned in other places such as CASSANDRA-8047 and in the wild,
> sometimes you need to go back. A downgrade sstables utility would be nice
> for a lot of reasons and I don't know that supporting going back to the
> previous major version format would be too much code since we already support
> reading the previous version.
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