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Date: Wed, 4 Dec 2013 20:44:46 +0100
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Subject: Re: How to measure data transfer between data centers?
From: Tom van den Berge <tom@drillster.com>
To: user@cassandra.apache.org
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Hi Chris,

I think streaming is used for repair tasks, bulk loading and that kind of
things, but not for regular replication traffic.

I think you're right that I should look into network tools. I don't think
cassandra can supply this information.

Thanks,
Tom


On Wed, Dec 4, 2013 at 6:08 PM, Chris Burroughs
<chris.burroughs@gmail.com>wrote:

> https://wiki.apache.org/cassandra/Metrics has per node Streaming metrics
> that include total bytes/in out.  That is only a small bit of what you want
> though.
>
> For total DC bandwidth it might be more straightforward to measure this at
> the router/switch/fancy-network-gear level.
>
>
> On 12/03/2013 06:25 AM, Tom van den Berge wrote:
>
>> Is there a way to know how much data is transferred between two nodes, or
>> more specifically, between two data centers?
>>
>> I'm especially interested in how much data is being replicated from one
>> data center to another, to know how much of the available bandwidth is
>> used.
>>
>>
>> Thanks,
>> Tom
>>
>>
>


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<div dir=3D"ltr">Hi Chris,<div><br></div><div>I think streaming is used for=
 repair tasks, bulk loading and that kind of things, but not for regular re=
plication traffic.</div><div><br></div><div>I think you&#39;re right that I=
 should look into network tools. I don&#39;t think cassandra can supply thi=
s information.</div>
<div><br></div><div>Thanks,</div><div>Tom</div></div><div class=3D"gmail_ex=
tra"><br><br><div class=3D"gmail_quote">On Wed, Dec 4, 2013 at 6:08 PM, Chr=
is Burroughs <span dir=3D"ltr">&lt;<a href=3D"mailto:chris.burroughs@gmail.=
com" target=3D"_blank">chris.burroughs@gmail.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"><a href=3D"https://wiki.apache.org/cassandra=
/Metrics" target=3D"_blank">https://wiki.apache.org/<u></u>cassandra/Metric=
s</a> has per node Streaming metrics that include total bytes/in out. =A0Th=
at is only a small bit of what you want though.<br>

<br>
For total DC bandwidth it might be more straightforward to measure this at =
the router/switch/fancy-network-<u></u>gear level.<div class=3D"HOEnZb"><di=
v class=3D"h5"><br>
<br>
On 12/03/2013 06:25 AM, Tom van den Berge wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Is there a way to know how much data is transferred between two nodes, or<b=
r>
more specifically, between two data centers?<br>
<br>
I&#39;m especially interested in how much data is being replicated from one=
<br>
data center to another, to know how much of the available bandwidth is used=
.<br>
<br>
<br>
Thanks,<br>
Tom<br>
<br>
</blockquote>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>=
<div><img src=3D"http://www.drillster.com/media/logo-signature.png"><br></d=
iv><div><p>Drillster BV<br>Middenburcht 136<br>3452MT Vleuten<br>Netherland=
s</p>
<p><a style=3D"color:rgb(17,85,204)">+31 30 755 5330</a></p><p>Open your fr=
ee account at=A0<a href=3D"http://www.drillster.com/" style=3D"color:rgb(17=
,85,204)" target=3D"_blank">www.drillster.com</a></p></div>
</div>

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