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From: Vijay <vijay2win@gmail.com>
Date: Wed, 12 May 2010 16:42:23 -0700
Message-ID: <AANLkTilml59kTIoW05xYoUFbHrlMr9rTICplGIvQMKaj@mail.gmail.com>
Subject: Re: key is sorted?
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=00163630fce7c51ed404866e32d2

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If you use Random partitioner, You will *NOT* get RowKey's sorted. (Columns
are sorted always).

Answer: If used Random partitioner
True True

Regards,
</VJ>



On Wed, May 12, 2010 at 1:25 AM, David Boxenhorn <david@lookin2.com> wrote:

> You do any kind of range slice, e.g. keys beginning with "abc"? But the
> results will not be ordered?
>
> Please answer one of the following:
>
> True True
> True False
> False False
>
> Explain?
>
> Thanks!
>
>
> On Sun, May 9, 2010 at 8:27 PM, Vijay <vijay2win@gmail.com> wrote:
>
>> True, The Range slice support was enabled in Random Partitioner for the
>> hadoop support.
>>
>> Random partitioner actually hash the Key and those keys are sorted so we
>> cannot have the actual key in order.... (Hope this doesnt confuse you)...
>>
>> Regards,
>> </VJ>
>>
>>
>>
>> On Sun, May 9, 2010 at 12:00 AM, David Boxenhorn <david@lookin2.com>wrote:
>>
>>> This is something that I'm not sure that I understand. Can somebody
>>> confirm/deny that I understand it? Thanks.
>>>
>>> If you use random partitioning, you can loop through all keys with a
>>> range query, but they will not be sorted.
>>>
>>> True or False?
>>>
>>> On Sat, May 8, 2010 at 3:45 AM, AJ Chen <ajchen@web2express.org> wrote:
>>>
>>>> thanks, that works. -aj
>>>>
>>>>
>>>> On Fri, May 7, 2010 at 1:17 PM, Stu Hood <stu.hood@rackspace.com>wrote:
>>>>
>>>>> Your IPartitioner implementation decides how the row keys are sorted:
>>>>> see http://wiki.apache.org/cassandra/StorageConfiguration#Partitioner. You need to be using one of the OrderPreservingPartitioners if you'd like
>>>>> a reasonable order for the keys.
>>>>>
>>>>> -----Original Message-----
>>>>> From: "AJ Chen" <ajchen@web2express.org>
>>>>> Sent: Friday, May 7, 2010 3:10pm
>>>>> To: user@cassandra.apache.org
>>>>> Subject: key is sorted?
>>>>>
>>>>> I have a super column family for "topic", key being the name of the
>>>>> topic.
>>>>> <ColumnFamily Name="Topic" CompareWith="UTF8Type" ColumnType="Super"
>>>>> CompareSubcolumnsWith="BytesType" />
>>>>> When I retrieve the rows, the rows are not sorted by the key. Is the
>>>>> row key
>>>>> sorted in cassandra by default?
>>>>>
>>>>> -aj
>>>>> --
>>>>> AJ Chen, PhD
>>>>> Chair, Semantic Web SIG, sdforum.org
>>>>> http://web2express.org
>>>>> twitter @web2express
>>>>> Palo Alto, CA, USA
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> AJ Chen, PhD
>>>> Chair, Semantic Web SIG, sdforum.org
>>>> http://web2express.org
>>>> twitter @web2express
>>>> Palo Alto, CA, USA
>>>>
>>>
>>>
>>
>

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If you use Random partitioner, You will <b>NOT</b> get RowKey&#39;s<span cl=
ass=3D"Apple-style-span" style=3D"font-family: sans-serif; font-size: 16px;=
 font-weight: bold; ">=C2=A0</span>sorted. (Columns are sorted always).<div=
><br></div>

<div>Answer: If used Random partitioner</div><div>True True<br><div><br cle=
ar=3D"all">Regards,<br>&lt;/VJ&gt;<br><br>
<br><br><div class=3D"gmail_quote">On Wed, May 12, 2010 at 1:25 AM, David B=
oxenhorn <span dir=3D"ltr">&lt;<a href=3D"mailto:david@lookin2.com">david@l=
ookin2.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

<div dir=3D"ltr">You do any kind of range slice, e.g. keys beginning with &=
quot;abc&quot;? But the results will not be ordered? <br><br>Please answer =
one of the following:<br><br>True True<br>True False<br>False False<br><br>


Explain? <br><br>Thanks!<div><div></div><div class=3D"h5"><br><br><div clas=
s=3D"gmail_quote">On Sun, May 9, 2010 at 8:27 PM, Vijay <span dir=3D"ltr">&=
lt;<a href=3D"mailto:vijay2win@gmail.com" target=3D"_blank">vijay2win@gmail=
.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0pt 0pt 0pt 0.8ex;border-=
left:1px solid rgb(204, 204, 204);padding-left:1ex">
True, The Range slice support was enabled in Random Partitioner for the had=
oop support.=C2=A0<div><br><div>Random partitioner actually hash the Key an=
d those keys are sorted so we cannot have the actual key in order.... (Hope=
 this doesnt confuse you)...</div>




<div><br clear=3D"all">Regards,<br>&lt;/VJ&gt;<br><br>
<br><br><div class=3D"gmail_quote"><div>On Sun, May 9, 2010 at 12:00 AM, Da=
vid Boxenhorn <span dir=3D"ltr">&lt;<a href=3D"mailto:david@lookin2.com" ta=
rget=3D"_blank">david@lookin2.com</a>&gt;</span> wrote:<br></div><div>
<div></div><div><blockquote class=3D"gmail_quote" style=3D"margin:0pt 0pt 0=
pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">

<div dir=3D"ltr">This is something that I&#39;m not sure that I understand.=
 Can somebody confirm/deny that I understand it? Thanks.<br><br>If you use =
random partitioning, you can loop through all keys with a range query, but =
they will not be sorted.<br>





<br>True or False? <br><br><div class=3D"gmail_quote">On Sat, May 8, 2010 a=
t 3:45 AM, AJ Chen <span dir=3D"ltr">&lt;<a href=3D"mailto:ajchen@web2expre=
ss.org" target=3D"_blank">ajchen@web2express.org</a>&gt;</span> wrote:<br><=
blockquote class=3D"gmail_quote" style=3D"margin:0pt 0pt 0pt 0.8ex;border-l=
eft:1px solid rgb(204, 204, 204);padding-left:1ex">





<tt>thanks, that works. -aj</tt><div><div></div><div><br><br><div class=3D"=
gmail_quote">On Fri, May 7, 2010 at 1:17 PM, Stu Hood <span dir=3D"ltr">&lt=
;<a href=3D"mailto:stu.hood@rackspace.com" target=3D"_blank">stu.hood@racks=
pace.com</a>&gt;</span> wrote:<br>






<blockquote class=3D"gmail_quote" style=3D"border-left:1px solid rgb(204, 2=
04, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex">
Your IPartitioner implementation decides how the row keys are sorted: see <=
a href=3D"http://wiki.apache.org/cassandra/StorageConfiguration#Partitioner=
" target=3D"_blank">http://wiki.apache.org/cassandra/StorageConfiguration#P=
artitioner</a> . You need to be using one of the OrderPreservingPartitioner=
s if you&#39;d like a reasonable order for the keys.<br>








<div><div></div><div><br>
-----Original Message-----<br>
From: &quot;AJ Chen&quot; &lt;<a href=3D"mailto:ajchen@web2express.org" tar=
get=3D"_blank">ajchen@web2express.org</a>&gt;<br>
Sent: Friday, May 7, 2010 3:10pm<br>
To: <a href=3D"mailto:user@cassandra.apache.org" target=3D"_blank">user@cas=
sandra.apache.org</a><br>
Subject: key is sorted?<br>
<br>
I have a super column family for &quot;topic&quot;, key being the name of t=
he topic.<br>
&lt;ColumnFamily Name=3D&quot;Topic&quot; CompareWith=3D&quot;UTF8Type&quot=
; ColumnType=3D&quot;Super&quot;<br>
CompareSubcolumnsWith=3D&quot;BytesType&quot; /&gt;<br>
When I retrieve the rows, the rows are not sorted by the key. Is the row ke=
y<br>
sorted in cassandra by default?<br>
<br>
-aj<br>
--<br>
AJ Chen, PhD<br>
Chair, Semantic Web SIG, <a href=3D"http://sdforum.org" target=3D"_blank">s=
dforum.org</a><br>
<a href=3D"http://web2express.org" target=3D"_blank">http://web2express.org=
</a><br>
twitter @web2express<br>
Palo Alto, CA, USA<br>
<br>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br>AJ Chen, Ph=
D<br>Chair, Semantic Web SIG, <a href=3D"http://sdforum.org" target=3D"_bla=
nk">sdforum.org</a><br><a href=3D"http://web2express.org" target=3D"_blank"=
>http://web2express.org</a><br>






twitter @web2express<br>
Palo Alto, CA, USA<br>
</div></div></blockquote></div><br></div>
</blockquote></div></div></div><br></div></div>
</blockquote></div><br></div></div></div>
</blockquote></div><br></div></div>

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