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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Research on scalability bug finder for Cassandra
Date Sat, 09 Apr 2016 01:03:09 GMT
Sounds very interesting!  We'd love to hear more about your approach.  In
particular, does it require a patched version of Cassandra?

On Thu, Apr 7, 2016 at 6:18 PM, Tanakorn Leesatapornwongsa <
tanakorn@cs.uchicago.edu> wrote:

> Dear Cassandra development team,
>
> We are computer science researchers at the University of Chicago.  Our
> research is about the reliability of cloud-scale distributed systems.
> Samples of our work can be found here: http://ucare.cs.uchicago.edu <
> http://ucare.cs.uchicago.edu/>
>
> We are reaching out to you because we are interested in reproducing any
> unsolved scalability bugs in Cassandra.
>
> We define scalability bugs as latent bugs that are scale-dependent.  They
> don't arise in small-scale deployment but arise in large-scale production
> runs.  For example, everything is fine in 100-node deployment but in
> 500-node deployment the bug appears.
>
> We have created a scale-check methodology (SLCK) that can unearth
> scalability bugs in a single machine.  With SLCK, we can run hundreds of
> nodes on a single machine and reproduce some old scalability bugs. For
> example, we have reproduced the following bugs in one machine:
>
> - https://issues.apache.org/jira/browse/CASSANDRA-6127 <
> https://issues.apache.org/jira/browse/CASSANDRA-6127>   (a customer
> observed node flapping when bootstrapping 1000 nodes)
>
> - https://issues.apache.org/jira/browse/CASSANDRA-3831 <
> https://issues.apache.org/jira/browse/CASSANDRA-3831>
>
> We are submitting SLCK for publication soon, and we can send you a draft a
> month from now if you are interested.
>
> To make a stronger publication submission, beyond reproducing old bugs, we
> thought it would be great if SLCK can reproduce new scalability bugs (if
> any) that you are still trying to resolve.
>
> We hope you find our work interesting and we would really appreciate if
> you can point to us any new scalability bugs that hopefully we can help you
> reproduce.
>
> Thank you very much for your attention!
>
> Best,
> Tanakorn L.
>
>
>
>


-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder, http://www.datastax.com
@spyced

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