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In-Reply-To: <AANLkTi=Xn5TQsy68hXt4RscJnPcGyvotQi=Dx=TDgmoD@mail.gmail.com>
References: <AANLkTi=Xn5TQsy68hXt4RscJnPcGyvotQi=Dx=TDgmoD@mail.gmail.com>
Date: Wed, 27 Oct 2010 12:40:26 -0500
Message-ID: <AANLkTi=J=Cjjr3va3xP2B_u2EZFtBTxMHKozhSMU63AL@mail.gmail.com>
Subject: Re: Cluster load balancing?
From: Tyler Hobbs <tyler@riptano.com>
To: user@cassandra.apache.org
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With OrderPreservingPartitioner, you have to keep the ring balanced
manually.
This is why people frequently suggest that you use RandomPartitioner unless
you absolutely have to do otherwise.  With OPP, keys are *not* evenly
distributed
around the ring.

Apparently you have lots of keys that are between ~'t' and 'x', so start
bunching
your tokens there.

- Tyler

On Wed, Oct 27, 2010 at 12:00 PM, Thibaut Britz <
thibaut.britz@trendiction.com> wrote:

> Hi,
>
> I have a little java hector test application running whcih writes and reads
> data to my little cassandra cluster (7 nodes).
>
> The data doesn't get loadbalanced at all:
>
> 192.168.1.12 Up         178.32 MB
> 8S6VvT7oKNcQTso3                           |<--|
> 192.168.1.14 Up         30.12 MB
> 9tybk3nB6JCtqQU1                           |   ^
> 192.168.1.15 Up         11.96 MB
> RZVG3NC3ksqjEmYE                           v   |
> 192.168.1.16 Up         668.7 KB
> aTV6W12YxxMI31Z8                           |   ^
> 192.168.1.10 Up         22.86 GB
> u5iaQxEfyUSwnPn1                           v   |
> 192.168.1.13 Up         22.5 GB
> vZlWeU8b6LBeAcAY                           |   ^
> 192.168.1.11 Up         22.27 GB
> xrmaUS6nnrYFSk8e                           |-->|
>
> What could be the issue? I couldn't find anything in the FAQ related to
> this
>
> Will data (writes) always be added to the server I connect to? If so, why
> will the replicas then always be stored on the same 2 other machines.
>
> (Tested with
> <Partitioner>org.apache.cassandra.dht.OrderPreservingPartitioner</Partitioner>
> on 0.6.5 and replication level 3)
>
> Thanks,
> Thibaut
>
>
>
>

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Content-Transfer-Encoding: quoted-printable

With OrderPreservingPartitioner, you have to keep the ring balanced manuall=
y.<br>This is why people frequently suggest that you use RandomPartitioner =
unless<br>you absolutely have to do otherwise.=A0 With OPP, keys are *not* =
evenly distributed<br>
around the ring.<br><br>Apparently you have lots of keys that are between ~=
&#39;t&#39; and &#39;x&#39;, so start bunching<br>your tokens there.<br><br=
>- Tyler<br><br><div class=3D"gmail_quote">On Wed, Oct 27, 2010 at 12:00 PM=
, Thibaut Britz <span dir=3D"ltr">&lt;<a href=3D"mailto:thibaut.britz@trend=
iction.com">thibaut.britz@trendiction.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi,<br><br>I have=
 a little java hector test application running whcih writes and reads data =
to my little cassandra cluster (7 nodes).<br>
<br>The data doesn&#39;t get loadbalanced at all:<br><br>192.168.1.12 Up=A0=
=A0=A0=A0=A0=A0=A0=A0 178.32 MB=A0=A0=A0=A0 8S6VvT7oKNcQTso3=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 |&lt;--|<br=
>
192.168.1.14 Up=A0=A0=A0=A0=A0=A0=A0=A0 30.12 MB=A0=A0=A0=A0=A0 9tybk3nB6JC=
tqQU1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0 |=A0=A0 ^<br>192.168.1.15 Up=A0=A0=A0=A0=A0=A0=A0=A0 11.96 MB=A0=
=A0=A0=A0=A0 RZVG3NC3ksqjEmYE=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 v=A0=A0 |<br>192.168.1.16 Up=A0=A0=A0=A0=
=A0=A0=A0=A0 668.7 KB=A0=A0=A0=A0=A0 aTV6W12YxxMI31Z8=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 |=A0=A0 ^<br>

192.168.1.10 Up=A0=A0=A0=A0=A0=A0=A0=A0 22.86 GB=A0=A0=A0=A0=A0 u5iaQxEfyUS=
wnPn1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0 v=A0=A0 |<br>192.168.1.13 Up=A0=A0=A0=A0=A0=A0=A0=A0 22.5 GB=A0=
=A0=A0=A0=A0=A0 vZlWeU8b6LBeAcAY=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 |=A0=A0 ^<br>192.168.1.11 Up=A0=A0=A0=
=A0=A0=A0=A0=A0 22.27 GB=A0=A0=A0=A0=A0 xrmaUS6nnrYFSk8e=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 |--&gt;|<br>

<br>What could be the issue? I couldn&#39;t find anything in the FAQ relate=
d to this<br><br>Will data (writes) always be added to the server I connect=
 to? If so, why will the replicas then always be stored on the same 2 other=
 machines.<br>

<br>(Tested with &lt;Partitioner&gt;org.apache.cassandra.dht.OrderPreservin=
gPartitioner&lt;/Partitioner&gt; on 0.6.5 and replication level 3)<br><br>T=
hanks,<br><font color=3D"#888888">Thibaut<br><br><br><br>
</font></blockquote></div><br>

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