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From Rakesh Kumar <rakeshkumar...@outlook.com>
Subject Re: scylladb
Date Fri, 10 Mar 2017 17:57:42 GMT
Cassanda vs Scylla is a valid comparison because they both are compatible.  Scylla is a drop-in
replacement for Cassandra.
Is Aerospike a drop-in replacement for Cassandra? If yes, and only if yes, then the comparison
is valid with Scylla.


________________________________
From: Bhuvan Rawal <bhu1rawal@gmail.com>
To: user@cassandra.apache.org
Sent: Friday, March 10, 2017 11:59 AM
Subject: Re: scylladb

Agreed C++ gives an added advantage to talk to underlying hardware with better efficiency,
it sound good but can a pice of code written in C++ give 1000% throughput than a Java app?
Is TPC design 10X more performant than SEDA arch?

And if C/C++ is indeed that fast how can Aerospike (which is itself written in C) claim to
be 10X faster than Scylla here http://www.aerospike.com/benchmarks/scylladb-initial/ ? (Combining
your's and aerospike's benchmarks it appears that Aerospike is 100X performant than C* - I
highly doubt that!! )

For a moment lets forget about evaluating 2 different databases, one can observe 10X performance
difference between a mistuned cassandra cluster and one thats tuned as per data model - there
are so many Tunables in yaml as well as table configs.

Idea is - in order to strengthen your claim, you need to provide complete system metrics (Disk,
CPU, Network), the OPS increase starts to decay along with the configs used. Having plain
ops per second and 99p latency is blackbox.

Regards,
Bhuvan

On Fri, Mar 10, 2017 at 12:47 PM, Avi Kivity <avi@scylladb.com<mailto:avi@scylladb.com>>
wrote:
ScyllaDB engineer here.

C++ is really an enabling technology here. It is directly responsible for a small fraction
of the gain by executing faster than Java.  But it is indirectly responsible for the gain
by allowing us direct control over memory and threading.  Just as an example, Scylla starts
by taking over almost all of the machine's memory, and dynamically assigning it to memtables,
cache, and working memory needed to handle requests in flight.  Memory is statically partitioned
across cores, allowing us to exploit NUMA fully.  You can't do these things in Java.

I would say the major contributors to Scylla performance are:
 - thread-per-core design
 - replacement of the page cache with a row cache
 - careful attention to many small details, each contributing a little, but with a large overall
impact

While I'm here I can say that performance is not the only goal here, it is stable and predictable
performance over varying loads and during maintenance operations like repair, without any
special tuning.  We measure the amount of CPU and I/O spent on foreground (user) and background
(maintenance) tasks and divide them fairly.  This work is not complete but already makes operating
Scylla a lot simpler.


On 03/10/2017 01:42 AM, Kant Kodali wrote:
I dont think ScyllaDB performance is because of C++. The design decisions in scylladb are
indeed different from Cassandra such as getting rid of SEDA and moving to TPC and so on.

If someone thinks it is because of C++ then just show the benchmarks that proves it is indeed
the C++ which gave 10X performance boost as ScyllaDB claims instead of stating it.


On Thu, Mar 9, 2017 at 3:22 PM, Richard L. Burton III <mrburton@gmail.com<mailto:mrburton@gmail.com>>
wrote:
They spend an enormous amount of time focusing on performance. You can expect them to continue
on with their optimization and keep crushing it.

P.S., I don't work for ScyllaDB.

On Thu, Mar 9, 2017 at 6:02 PM, Rakesh Kumar <rakeshkumar464@outlook.com<mailto:rakeshkumar464@outlook.com>>
wrote:
In all of their presentation they keep harping on the fact that scylladb is written in C++
and does not carry the overhead of Java.  Still the difference looks staggering.
______________________________ __________
From: daemeon reiydelle <daemeonr@gmail.com<mailto:daemeonr@gmail.com>>
Sent: Thursday, March 9, 2017 14:21
To: user@cassandra.apache.org<mailto:user@cassandra.apache.org>
Subject: Re: scylladb

The comparison is fair, and conservative. Did substantial performance comparisons for two
clients, both results returned throughputs that were faster than the published comparisons
(15x as I recall). At that time the client preferred to utilize a Cass COTS solution and use
a caching solution for OLA compliance.


.......

Daemeon C.M. Reiydelle
USA (+1) 415.501.0198
London (+44) (0) 20 8144 9872

On Thu, Mar 9, 2017 at 11:04 AM, Robin Verlangen <robin@us2.nl<mailto:robin@us2.nl><mailto:robin@us2
.nl<mailto:robin@us2.nl>>> wrote:
I was wondering how people feel about the comparison that's made here between Cassandra and
ScyllaDB : http://www.scylladb.com/techno logy/ycsb-cassandra-scylla/#re sults-of-3-scylla-nodes-vs-30-
cassandra-nodes<http://www.scylladb.com/technology/ycsb-cassandra-scylla/#results-of-3-scylla-nodes-vs-30-cassandra-nodes>

They are claiming a 10x improvement, is that a fair comparison or maybe a somewhat coloured
view of a (micro)benchmark in a specific setup? Any pros/cons known?

Best regards,

Robin Verlangen
Chief Data Architect

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On Wed, Dec 16, 2015 at 11:52 AM, Carlos Rolo <rolo@pythian.com<mailto:rolo@pythian.com><mailto:rolo@
pythian.com<mailto:rolo@pythian.com>>> wrote:
No rain at all! But I almost had it running last weekend, but stopped short of installing
it. Let's see if this one is for real!

Regards,

Carlos Juzarte Rolo
Cassandra Consultant

Pythian - Love your data

rolo@pythian | Twitter: @cjrolo | Linkedin: linkedin.com/in/carlosjuzarter olo<http://linkedin.com/in/carlosjuzarterolo><http://linkedin.com/in/car
losjuzarterolo<http://linkedin.com/in/carlosjuzarterolo>>
Mobile: +351 91 891 81 00<tel:+351%20918%20918%20100> | Tel: +1 613 565 8696 x1649<tel:+1%20613-565-8696>
www.pythian.com<http://www.pythian.com/><http://www.pyt hian.com/<http://www.pythian.com/>>

On Wed, Dec 16, 2015 at 12:38 AM, Dani Traphagen <dani.traphagen@datastax.com<mailto:dani.traphagen@datastax.com><m
ailto:dani.traphagen@datastax. com<mailto:dani.traphagen@datastax.com>>> wrote:
You'll be the first Carlos.

[Inline image 1]

Had any rain lately? Curious how this went, if so.

On Thu, Nov 12, 2015 at 4:36 AM, Jack Krupansky <jack.krupansky@gmail.com<mailto:jack.krupansky@gmail.com><mail
to:jack.krupansky@gmail.com<mailto:jack.krupansky@gmail.com>>> wrote:
I just did a Twitter search on scylladb and did not see any tweets about actual use, so far.


-- Jack Krupansky

On Wed, Nov 11, 2015 at 10:54 AM, Carlos Alonso <info@mrcalonso.com<mailto:info@mrcalonso.com><mailto:inf
o@mrcalonso.com<mailto:info@mrcalonso.com>>> wrote:
Any update about this?

@Carlos Rolo, did you tried it? Thoughts?

Carlos Alonso | Software Engineer | @calonso<https://twitter.com/c alonso<https://twitter.com/calonso>>

On 5 November 2015 at 14:07, Carlos Rolo <rolo@pythian.com<mailto:rolo@pythian.com><mailto:rolo@
pythian.com<mailto:rolo@pythian.com>>> wrote:
Something to do on a expected rainy weekend. Thanks for the information.

Regards,

Carlos Juzarte Rolo
Cassandra Consultant

Pythian - Love your data

rolo@pythian | Twitter: @cjrolo | Linkedin: linkedin.com/in/carlosjuzarter olo<http://linkedin.com/in/carlosjuzarterolo><http://linkedin.com/in/car
losjuzarterolo<http://linkedin.com/in/carlosjuzarterolo>>
Mobile: +351 91 891 81 00<tel:%2B351%2091%20891%2081% 2000> | Tel: +1 613 565 8696 x1649<tel:%2B1%20613%20565%208
696%20x1649>
www.pythian.com<http://www.pythian.com/><http://www.pyt hian.com/<http://www.pythian.com/>>

On Thu, Nov 5, 2015 at 12:07 PM, Dani Traphagen <dani.traphagen@datastax.com<mailto:dani.traphagen@datastax.com><m
ailto:dani.traphagen@datastax. com<mailto:dani.traphagen@datastax.com>>> wrote:
As of two days ago, they say they've got it @cjrolo.

https://github.com/scylladb/sc ylla/wiki/RELEASE-Scylla-0.11- Beta<https://github.com/scylladb/scylla/wiki/RELEASE-Scylla-0.11-Beta>


On Thursday, November 5, 2015, Carlos Rolo <rolo@pythian.com<mailto:rolo@pythian.com><mailto:rolo@
pythian.com<mailto:rolo@pythian.com>>> wrote:
I will not try until multi-DC is implemented. More than an month has passed since I looked
for it, so it could possibly be in place, if so I may take some time to test it.

Regards,

Carlos Juzarte Rolo
Cassandra Consultant

Pythian - Love your data

rolo@pythian | Twitter: @cjrolo | Linkedin: linkedin.com/in/carlosjuzarter olo<http://linkedin.com/in/carlosjuzarterolo><http://linkedin.com/in/car
losjuzarterolo<http://linkedin.com/in/carlosjuzarterolo>>
Mobile: +351 91 891 81 00<tel:%2B351%2091%20891%2081% 2000> | Tel: +1 613 565 8696 x1649<tel:%2B1%20613%20565%208
696%20x1649>
www.pythian.com<http://www.pythian.com/><http://www.pyt hian.com/<http://www.pythian.com/>>

On Thu, Nov 5, 2015 at 9:37 AM, Jon Haddad <jonathan.haddad@gmail.com<mailto:jonathan.haddad@gmail.com>>
wrote:
Nope, no one I know.  Let me know if you try it I'd love to hear your feedback.

> On Nov 5, 2015, at 9:22 AM, tommaso barbugli <tbarbugli@gmail.com<mailto:tbarbugli@gmail.com>>
wrote:
>
> Hi guys,
>
> did anyone already try Scylladb (yet another fastest NoSQL database in town) and has
some thoughts/hands-on experience to share?
>
> Cheers,
> Tommaso




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