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Date: Wed, 2 Jul 2014 18:00:23 -0700
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Subject: Re: Setting up DSE 4.5 for mixed workload with BYOH
From: Tupshin Harper <tupshin@tupshin.com>
To: user@cassandra.apache.org
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For performance reasons, you shouldn't enable vnodes on any Cassandra/DSE
datacenter that is doing hadoop analytics workloads.  Other DCs in the
cluster can use vnodes.

-Tupshin
On Jul 2, 2014 5:50 PM, "Clint Kelly" <clint.kelly@gmail.com> wrote:

> Hi everyone,
>
> Apologies if this is the incorrect forum for a question like this.
>
> I am going to set up a mixed-workload (real-time and analytics)
> installation of DSE 4.5 using bring-your-own Hadoop (BYOH).  We are
> using CDH 5.0.
>
> I was reviewing the installation instructions, and I came across the
> following comment here:
>
> http://www.datastax.com/documentation/datastax_enterprise/4.5/datastax_enterprise/byoh/byohInstall.html
>
> "6. Observe workload isolation best practices. Do not enable vnodes."
>
> Does this mean that the use of vnodes is not compatible with a
> mixed-workload installation?  Or with BYOH?  I am confused why this
> would be the case.
>
> If anyone can clarify, I would greatly appreciate it.
>
> Best regards,
> Clint
>

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<p dir=3D"ltr">For performance reasons, you shouldn&#39;t enable vnodes on =
any Cassandra/DSE datacenter that is doing hadoop analytics workloads.=C2=
=A0 Other DCs in the cluster can use vnodes. </p>
<p dir=3D"ltr">-Tupshin </p>
<div class=3D"gmail_quote">On Jul 2, 2014 5:50 PM, &quot;Clint Kelly&quot; =
&lt;<a href=3D"mailto:clint.kelly@gmail.com">clint.kelly@gmail.com</a>&gt; =
wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi everyone,<br>
<br>
Apologies if this is the incorrect forum for a question like this.<br>
<br>
I am going to set up a mixed-workload (real-time and analytics)<br>
installation of DSE 4.5 using bring-your-own Hadoop (BYOH). =C2=A0We are<br=
>
using CDH 5.0.<br>
<br>
I was reviewing the installation instructions, and I came across the<br>
following comment here:<br>
<a href=3D"http://www.datastax.com/documentation/datastax_enterprise/4.5/da=
tastax_enterprise/byoh/byohInstall.html" target=3D"_blank">http://www.datas=
tax.com/documentation/datastax_enterprise/4.5/datastax_enterprise/byoh/byoh=
Install.html</a><br>

<br>
&quot;6. Observe workload isolation best practices. Do not enable vnodes.&q=
uot;<br>
<br>
Does this mean that the use of vnodes is not compatible with a<br>
mixed-workload installation? =C2=A0Or with BYOH? =C2=A0I am confused why th=
is<br>
would be the case.<br>
<br>
If anyone can clarify, I would greatly appreciate it.<br>
<br>
Best regards,<br>
Clint<br>
</blockquote></div>

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