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Date: Thu, 5 Dec 2013 18:58:46 -0800
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Subject: Re: vnodes on aws
From: Andrey Ilinykh <ailinykh@gmail.com>
To: user@cassandra.apache.org
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On Thu, Dec 5, 2013 at 3:31 PM, Jayadev Jayaraman <jdisalive@gmail.com>wrote:

> Availability zones are analogous to racks not data centres . EC2 regions
> are equivalent to data centres.
>
Yes, this is what I meant. I guess my question is - is possible to put row
in every rack using vnodes?

Thank you,
   Andrey


> On Dec 5, 2013 2:32 PM, "Andrey Ilinykh" <ailinykh@gmail.com> wrote:
>
>> Hello everybody!
>> We run cassandra 1.1 on ec2 instances. We use three availability zones,
>> the replication factor is 3 also. NetworkTopologyStrategy guarantees each
>> row is replicated in all availability zones. So, if we lost one zone quorum
>> operations still work. We think about to upgrade to 1.2. Virtual nodes are
>> the main reason. My understanding is - vnodes are distributed randomly, so
>> their is no way to put every row into all availability zones.  Am I right?
>> What would be the best way to deploy vnodes across several data centers
>> (availability zones)?
>>
>>
>> Thank you,
>>   Andrey
>>
>

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Thu, Dec 5, 2013 at 3:31 PM, Jayadev Jayaraman <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:jdisalive@gmail.com" target=3D"_blank">jdisalive@gma=
il.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><p dir=3D"ltr">Availability zones are analog=
ous to racks not data centres . EC2 regions are equivalent to data centres.=
</p>
</blockquote><div>Yes, this is what I meant. I guess my question is - is po=
ssible to put row in every rack using vnodes?</div><div><br></div><div>Than=
k you,</div><div>=A0 =A0Andrey</div><div><br></div><div>=A0</div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex">
<div class=3D"HOEnZb"><div class=3D"h5"><div class=3D"gmail_quote">On Dec 5=
, 2013 2:32 PM, &quot;Andrey Ilinykh&quot; &lt;<a href=3D"mailto:ailinykh@g=
mail.com" target=3D"_blank">ailinykh@gmail.com</a>&gt; wrote:<br type=3D"at=
tribution">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<div dir=3D"ltr">Hello everybody!<div>We run cassandra 1.1 on ec2 instances=
. We use three availability zones, the replication factor is 3 also. Networ=
kTopologyStrategy guarantees each row is replicated in all availability zon=
es. So, if we lost one zone quorum operations still work. We think about to=
 upgrade to 1.2. Virtual nodes are the main reason. My understanding is - v=
nodes are distributed randomly, so their is no way to put every row into al=
l availability zones. =A0Am I right? What would be the best way to deploy v=
nodes across several data centers (availability zones)?</div>


<div><br></div><div><br></div><div>Thank you,</div><div>=A0 Andrey=A0</div>=
</div>
</blockquote></div>
</div></div></blockquote></div></div></div>

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