Why no Cassandra in github.com/jepsen-io/jepsen

[chendon...@gmail.com]

Why no Cassandra test in github.com/jepsen-io/jepsen?

Where do I find out the code(https://github.com/jepsen-io/jepsen/blob/master/src/jepsen/cassandra.clj#L35-L80) mentioned in https://aphyr.com/posts/294-jepsen-cassandra?

[Kyle Kingsbury]

It's in the 'old' branch. Sorry, I wasn't using stable links when I wrote that post.

On Thu, Apr 12, 2018, 02:39 <chendon...@gmail.com> wrote:

Why no Cassandra test in github.com/jepsen-io/jepsen?

Where do I find out the code(https://github.com/jepsen-io/jepsen/blob/master/src/jepsen/cassandra.clj#L35-L80) mentioned in https://aphyr.com/posts/294-jepsen-cassandra?

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[chen dongming]

Why did you continue to maintain cassandra part? Is it because Cassandra is already bug-free and no need to test?

I still think that Cassandra is not Linearability due to "Last Write Win” without lightweight transaction in its latest version, is it ?

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[Kyle Kingsbury]

On 04/12/2018 07:46 AM, chen dongming wrote:
> Why did you continue to maintain cassandra part?

I didn't maintain the Cassandra test. It's five years old, written for an
earlier version of Jepsen, and I haven't looked at it since.

> Is it because Cassandra is already bug-free and no need to test?

I very much doubt Cassandra is bug-free, although they have addressed some, and
perhaps all, of the issues I raised in that analysis. There's likely value in
testing it again. I just have other things to work on.

> I still think that Cassandra is not Linearability due to "Last Write Win”
> without lightweight transaction in its latest version, is it

That sounds reasonable. Any LWW system is going to allow lost updates, which
would preclude linearizability.

--Kyle

[chen dongming]

Thanks for your reply.
I am very glad to talk with you.

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