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Date: Tue, 15 Dec 2015 15:18:49 -0500
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 <CAOxAL615EbousG0UxGexNu7kL_PxVb-OwWyjkv1jDnBNvzRrAQ@mail.gmail.com>
Subject: Re: Better setup to start using in production on one server
From: Jack Krupansky <jack.krupansky@gmail.com>
To: user@cassandra.apache.org
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How much data and request load do you expect on this small cluster? If
fairly light, fine. But if heavy, be careful.

Someone else can chime in if they have a more solid answer on how many CPU
cores Cassandra needs, but less than two per node seems inappropriate
unless load is extremely light since it precludes much in the way of
concurrency.

Maybe you might be better off just running a single node on this box as
long as load is fairly light and then grow it to a full 6, 8, or 12 nodes
when data and request load warrant. Note that 3 nodes at RF=3D3 does not gi=
ve
you any additional data capacity although it does triple your request load
capacity. Six nodes is sort of the sweet spot, giving you HA with RF=3D3 an=
d
doubling data capacity with a bunch of nodes to handle load.


-- Jack Krupansky

On Tue, Dec 15, 2015 at 1:53 AM, Vladimir Prudnikov <v.prudnikov@gmail.com>
wrote:

>
> On 14 Dec 2015, at 21:40, Robert Coli <rcoli@eventbrite.com> wrote:
>
> On Mon, Dec 14, 2015 at 3:46 AM, Vladimir Prudnikov <v.prudnikov@gmail.co=
m
> > wrote:
>
>> [I want to run Cassandra on a single server]
>
>
> I struggle to imagine the purpose of doing this.
>
>
> Save money. I don=E2=80=99t have huge enterprise behind me nor investor=
=E2=80=99s money on
> my bank account. I just created an app and want to launch it and see if i=
t
> is what users will use and pay for. Once I get users using it I can scale
> my hardware.
>
> Is it hard to start with 3 nodes on one server running in docker and then
> just move 2 nodes to the separate servers?
>
>
> You are going to sign yourself up for repeated painful changes of RF, as
> well as downtimes. As Michael says, you will get most of the cost of a
> distributed database and none of the benefit.
>
>
> I'm pretty sure the ABSOLUTE MINIMUM reasonabl(ish) deploy of cassandra i=
s
> RF=3DN=3D2.
>
> =3DRob
>
>
>

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<div dir=3D"ltr">How much data and request load do you expect on this small=
 cluster? If fairly light, fine. But if heavy, be careful.<div><br></div><d=
iv>Someone else can chime in if they have a more solid answer on how many C=
PU cores Cassandra needs, but less than two per node seems inappropriate un=
less load is extremely light since it precludes much in the way of concurre=
ncy.</div><div><br></div><div>Maybe you might be better off just running a =
single node on this box as long as load is fairly light and then grow it to=
 a full 6, 8, or 12 nodes when data and request load warrant. Note that 3 n=
odes at RF=3D3 does not give you any additional data capacity although it d=
oes triple your request load capacity. Six nodes is sort of the sweet spot,=
 giving you HA with RF=3D3 and doubling data capacity with a bunch of nodes=
 to handle load.</div><div><br></div></div><div class=3D"gmail_extra"><br c=
lear=3D"all"><div><div class=3D"gmail_signature"><div dir=3D"ltr">-- Jack K=
rupansky</div></div></div>
<br><div class=3D"gmail_quote">On Tue, Dec 15, 2015 at 1:53 AM, Vladimir Pr=
udnikov <span dir=3D"ltr">&lt;<a href=3D"mailto:v.prudnikov@gmail.com" targ=
et=3D"_blank">v.prudnikov@gmail.com</a>&gt;</span> wrote:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div style=3D"word-wrap:break-word"><br><div><span class=
=3D""><blockquote type=3D"cite"><div>On 14 Dec 2015, at 21:40, Robert Coli =
&lt;<a href=3D"mailto:rcoli@eventbrite.com" target=3D"_blank">rcoli@eventbr=
ite.com</a>&gt; wrote:</div><br><div><div dir=3D"ltr"><div class=3D"gmail_e=
xtra"><div class=3D"gmail_quote">On Mon, Dec 14, 2015 at 3:46 AM, Vladimir =
Prudnikov <span dir=3D"ltr">&lt;<a href=3D"mailto:v.prudnikov@gmail.com" ta=
rget=3D"_blank">v.prudnikov@gmail.com</a>&gt;</span> wrote:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1=
px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:=
1ex">[I want to run Cassandra on a single server]</blockquote><div><br></di=
v><div>I struggle to imagine the purpose of doing this.</div></div></div></=
div></div></blockquote><div><br></div></span><div>Save money. I don=E2=80=
=99t have huge enterprise behind me nor investor=E2=80=99s money on my bank=
 account. I just created an app and want to launch it and see if it is what=
 users will use and pay for. Once I get users using it I can scale my hardw=
are.</div><div><br></div><div>Is it hard to start with 3 nodes on one serve=
r running in docker and then just move 2 nodes to the separate servers?</di=
v><span class=3D""><br><blockquote type=3D"cite"><div><div dir=3D"ltr"><div=
 class=3D"gmail_extra"><div class=3D"gmail_quote"><div><br></div><div>You a=
re going to sign yourself up for repeated painful changes of RF, as well as=
 downtimes. As Michael says, you will get most of the cost of a distributed=
 database and none of the benefit.</div></div></div></div></div></blockquot=
e><blockquote type=3D"cite"><div><div dir=3D"ltr"><div class=3D"gmail_extra=
"><div class=3D"gmail_quote"><div><br></div><div>I&#39;m pretty sure the AB=
SOLUTE MINIMUM reasonabl(ish) deploy of cassandra is RF=3DN=3D2.</div><div>=
<br></div><div>=3DRob</div><div><br></div></div></div></div>
</div></blockquote></span></div><br></div></blockquote></div><br></div>

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