Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (athena.apache.org: domain of bm3780@gmail.com designates
 209.85.213.44 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <CAEDUwd3aP1Dj8qT5eFuC_RK7f+xwQm7_+TRNv+1noE4fhbsG8Q@mail.gmail.com>
References: 
 <CAAgU4+Nd4xiJ4QaOUhTxbqHREj+qNap-_Vt5=FnbwRE9-MRUCA@mail.gmail.com>
	<CAA-p0Hr74T9ESQEY4uXnkDB41qW2q8-+PR9Xyr9x8Y=PvvgKyg@mail.gmail.com>
	<CAAgU4+M0TSagctXC-RzenbnvP9QpxCVO+HKVW5oRfqjDVKzDXA@mail.gmail.com>
	<CAEDUwd3aP1Dj8qT5eFuC_RK7f+xwQm7_+TRNv+1noE4fhbsG8Q@mail.gmail.com>
Date: Mon, 7 Apr 2014 16:41:01 -0400
Message-ID: 
 <CAAgU4+Nq-sPWS+vj2hsBYV5XBLyo1v05r7hUVmUANfv6r9g6Sw@mail.gmail.com>
Subject: Re: Migrating to new datacenter
From: Brandon McCauslin <bm3780@gmail.com>
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=089e01634dd4aa95d304f679e29d

--089e01634dd4aa95d304f679e29d
Content-Type: text/plain; charset=ISO-8859-1

Rob,

If I read your response in that 1st URL correctly, it seems changing both
the snitch and replication strategy at the same time is not advisable and
could lead to partial data loss.  Is your suggestion of dumping an
reloading the data into the new cluster still recommended for these
situations?


On Mon, Apr 7, 2014 at 2:09 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Mon, Apr 7, 2014 at 10:48 AM, Brandon McCauslin <bm3780@gmail.com>wrote:
>
>> Thanks for the confirmation on the approach.  The new dc is not yet
>> ready, but while I'm waiting I was thinking about updating the existing
>> dc's replication strategy from "SimpleStrategy" to
>> "NetworkTopologyStrategy".  I also assume I'll need to update my snitch
>> from the current SimpleSnitch to PropertyFileSnitch.  Here's the steps I'm
>> thinking:
>>
>
> Here's a brief explication of how this process works and can be made
> safe/testable :
>
>
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Ec2Snitch-amp-Other-snitches-td6196494.html
>
> Consider whether you actually want a rack aware Snitch :
>
> https://issues.apache.org/jira/browse/CASSANDRA-3810
>
> If you do, consider using the Gossiping Property File Snitch :
>
> https://issues.apache.org/jira/browse/CASSANDRA-1974
>
> =Rob
>
>

--089e01634dd4aa95d304f679e29d
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Rob,<div><br></div><div>If I read your response in that 1s=
t URL correctly, it seems changing both the snitch and replication strategy=
 at the same time is not advisable and could lead to partial data loss. =A0=
Is your suggestion of dumping an reloading the data into the new cluster st=
ill recommended for these situations?</div>

</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Mon,=
 Apr 7, 2014 at 2:09 PM, Robert Coli <span dir=3D"ltr">&lt;<a href=3D"mailt=
o:rcoli@eventbrite.com" target=3D"_blank">rcoli@eventbrite.com</a>&gt;</spa=
n> wrote:<br>
<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"><div class=3D"gmail_extra">=
<div class=3D"gmail_quote"><div class=3D"">On Mon, Apr 7, 2014 at 10:48 AM,=
 Brandon McCauslin <span dir=3D"ltr">&lt;<a href=3D"mailto:bm3780@gmail.com=
" target=3D"_blank">bm3780@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div dir=3D"ltr">Thanks for the confirmation on the approa=
ch. =A0The new dc is not yet ready, but while I&#39;m waiting I was thinkin=
g about updating the existing dc&#39;s replication strategy from &quot;Simp=
leStrategy&quot; to &quot;NetworkTopologyStrategy&quot;. =A0I also assume I=
&#39;ll need to update my snitch from the current SimpleSnitch to PropertyF=
ileSnitch. =A0Here&#39;s the steps I&#39;m thinking:</div>

</blockquote><div><br></div></div><div>Here&#39;s a brief explication of ho=
w this process works and can be made safe/testable :</div><div><br></div><d=
iv><a href=3D"http://cassandra-user-incubator-apache-org.3065146.n2.nabble.=
com/Ec2Snitch-amp-Other-snitches-td6196494.html" target=3D"_blank">http://c=
assandra-user-incubator-apache-org.3065146.n2.nabble.com/Ec2Snitch-amp-Othe=
r-snitches-td6196494.html</a></div>

<div><br></div><div>Consider whether you actually want a rack aware Snitch =
:</div><div><br></div><div><a href=3D"https://issues.apache.org/jira/browse=
/CASSANDRA-3810" target=3D"_blank">https://issues.apache.org/jira/browse/CA=
SSANDRA-3810</a></div>

<div><br></div><div>If you do, consider using the Gossiping Property File S=
nitch :</div><div><br></div><div><a href=3D"https://issues.apache.org/jira/=
browse/CASSANDRA-1974" target=3D"_blank">https://issues.apache.org/jira/bro=
wse/CASSANDRA-1974</a></div>

<div><br></div><div>=3DRob</div><div>=A0</div></div></div></div>
</blockquote></div><br></div>

--089e01634dd4aa95d304f679e29d--