Re: scylladb

Sat, 11 Mar 2017 11:39:07 -0800 

Here's a test (by Samsung MSL) comparing Scylla to Cassandra 3.9:

http://www.scylladb.com/2017/02/15/scylladb-vs-cassandra-performance-benchmark-samsung/

there's a link at the end to the original report.

On 03/11/2017 09:08 PM, Bhuvan Rawal wrote:
"Lastly, why don't you test Scylla yourself? It's pretty easy to set up, there's nothing to tune." - The details are indeed compelling to have a go ahead and test it for specific use case.
If it works out good it can lead to good cost cut in infra costs as well as having to manage less servers plus probably less time to bootstrap & decommission nodes!
It will also be interesting to have a benchmark with Cassandra 3 version as well, as the new storage engine is said to have better performance: https://www.datastax.com/2015/12/storage-engine-30 <https://www.datastax.com/2015/12/storage-engine-30> 

Regards,
Bhuvan
On Sat, Mar 11, 2017 at 2:59 PM, Avi Kivity <a...@scylladb.com <mailto:a...@scylladb.com>> wrote: 

    There is no magic 10X bullet.  It's a mix of multiple factors,
    which can come up to less than 10X in some circumstances and more
    than 10X in others, as has been reported on this thread by others.

    TPC doesn't give _any_ advantage when you have just one core, and
can give more than 10X on a machine with a large number of cores. These are becoming more and more common, think of the recent AMD 
    Naples announcement; with 32 cores per socket you can have 128
    logical cores in a two-socket server; or the AWS i3.16xlarge
    instance with 32 cores / 64 vcpus.

    You're welcome to browse our site to learn more about the
    architecture, or watch this technical talk [1] I gave in QConSF
    that highlights some of the techniques we use.

    Of course it's possible to mistune Cassandra to give bad results,
    that is why we spent a lot more time tuning Cassandra and
    documenting everything than we spent on Scylla.  You can read the
    report in [2], it is very detailed, and provides a wealth of
    metrics like you'd expect.

    I'm not going to comment about the Aerospike numbers, I haven't
    studied them in detail.  And no, you can't multiply results like
    that unless they were done with very similar configurations and
    test harnesses.

    Lastly, why don't you test Scylla yourself?  It's pretty easy to
    set up, there's nothing to tune.

    Avi

    [1] https://www.infoq.com/presentations/scylladb
    <https://www.infoq.com/presentations/scylladb>
    [2]
    http://www.scylladb.com/technology/cassandra-vs-scylla-benchmark-cluster-1/
    
<http://www.scylladb.com/technology/cassandra-vs-scylla-benchmark-cluster-1/>



    On 03/10/2017 06:58 PM, Bhuvan Rawal wrote:

    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/
    <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 <a...@scylladb.com
    <mailto:a...@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
        <mrbur...@gmail.com <mailto:mrbur...@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
            <rakeshkumar...@outlook.com
            <mailto:rakeshkumar...@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 <daeme...@gmail.com
                <mailto:daeme...@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 <tel:%28%2B1%29%20415.501.0198>
                London (+44) (0) 20 8144 9872
                <tel:%28%2B44%29%20%280%29%2020%208144%209872>

                On Thu, Mar 9, 2017 at 11:04 AM, Robin Verlangen
                <ro...@us2.nl
                <mailto:ro...@us2.nl><mailto:ro...@us2.nl
                <mailto:ro...@us2.nl>>> wrote:
                I was wondering how people feel about the comparison
                that's made here between Cassandra and ScyllaDB :
                
http://www.scylladb.com/technology/ycsb-cassandra-scylla/#results-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
                <r...@pythian.com
                <mailto:r...@pythian.com><mailto:r...@pythian.com
                <mailto:r...@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/carlosjuzarterolo
                
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                On Wed, Dec 16, 2015 at 12:38 AM, Dani Traphagen
                <dani.trapha...@datastax.com
                
<mailto:dani.trapha...@datastax.com><mailto:dani.trapha...@datastax.com
                <mailto:dani.trapha...@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.krupan...@gmail.com
                
<mailto:jack.krupan...@gmail.com><mailto:jack.krupan...@gmail.com
                <mailto:jack.krupan...@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
                <i...@mrcalonso.com
                <mailto:i...@mrcalonso.com><mailto:i...@mrcalonso.com
                <mailto:i...@mrcalonso.com>>> wrote:
                Any update about this?

                @Carlos Rolo, did you tried it? Thoughts?

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

                On 5 November 2015 at 14:07, Carlos Rolo
                <r...@pythian.com
                <mailto:r...@pythian.com><mailto:r...@pythian.com
                <mailto:r...@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/carlosjuzarterolo
                
<http://linkedin.com/in/carlosjuzarterolo><http://linkedin.com/in/carlosjuzarterolo
                <http://linkedin.com/in/carlosjuzarterolo>>
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<tel:%2B351%2091%20891%2081%2000><tel:%2B351%2091%20891%2081%2000>
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                On Thu, Nov 5, 2015 at 12:07 PM, Dani Traphagen
                <dani.trapha...@datastax.com
                
<mailto:dani.trapha...@datastax.com><mailto:dani.trapha...@datastax.com
                <mailto:dani.trapha...@datastax.com>>> wrote:
                As of two days ago, they say they've got it @cjrolo.

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


                On Thursday, November 5, 2015, Carlos Rolo
                <r...@pythian.com
                <mailto:r...@pythian.com><mailto:r...@pythian.com
                <mailto:r...@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/carlosjuzarterolo
                
<http://linkedin.com/in/carlosjuzarterolo><http://linkedin.com/in/carlosjuzarterolo
                <http://linkedin.com/in/carlosjuzarterolo>>
                Mobile: +351 91 891 81 00
                
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                On Thu, Nov 5, 2015 at 9:37 AM, Jon Haddad
                <jonathan.had...@gmail.com
                <mailto:jonathan.had...@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
                <tbarbu...@gmail.com <mailto:tbarbu...@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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