incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Nguyễn Minh Kha <nminh...@gmail.com>
Subject Re: Question about Token selection for order-preserving partitioner
Date Wed, 17 Feb 2010 01:05:46 GMT
Hi,

Thank Wojciech, I use TimeUUIDType for CF Comments, I'm not use it for init
token.

On Tue, Feb 16, 2010 at 11:45 PM, Wojciech Kaczmarek
<kaczmarek.w@gmail.com>wrote:

> Hi!
>
> My comment was supposed to mean that you don't use TimeUUIDType as a token
> because it's a possible column type, not a key type (at least is what I know
> from a wiki and my short experience, I didn't check the source). You've
> probably mistaken sorting of different columns within a row (which depends
> on a type of column) with sorting of your keys which is possible when using
> order-preserving partitioner. The sorting of keys seems to depend only on a
> specific partitioner class used in config.
>
> Application-specific keys distribution means that you should predict how
> your keys will be generated in order to set seeds for your nodes. If you're
> in doubt and this is your test environment you could just leave InitialToken
> empty.
>
> It would help if you told us what the semantics of your keys are.
>
>
> 2010/2/16 Nguyễn Minh Kha <nminhkha@gmail.com>
>
>> Hi!
>>
>> I think, my question is not clearly.
>>
>> I don't know to config these nodes for this cluster. I want to use
>> TimeUUIDType and order-preserving partitioner for range query.
>> How to config InitialToken and seeds for node01, node02, node03.
>>
>> I see the wiki topic Operations explain InitialToken for order-preserving
>> partitioner:
>>
>> [With order preserving partioners, your key distribution will be
>> application-dependent. You should still take your best guess at specifying
>> initial tokens (guided by sampling actual data, if possible), but you will
>> be more dependent on active load balancing (see below) and/or adding new
>> nodes to hot spots.]'
>>
>> I don't know [application-dependent]. And I don't know config seeds
>> section every node.
>>
>> Sorry for my english.
>>
>>
>> On Tue, Feb 16, 2010 at 7:58 PM, Wojciech Kaczmarek <
>> kaczmarek.w@gmail.com> wrote:
>>
>>> Hi!
>>>
>>> 2010/2/16 Nguyễn Minh Kha <nminhkha@gmail.com>
>>>
>>>
>>>> I read the wiki topic Operations<http://wiki.apache.org/cassandra/Operations>and
I don't understant way to use Token selection for order-preserving
>>>> partitioner (application-dependent).
>>>> I want create blog comment use TimeUUIDType and order-preserving for
>>>> range query, this cluster run in 3 nodes.
>>>>
>>>>
>>> How to add token, config seeds and more to run this cluster?
>>>>
>>>> Thank very much.
>>>>
>>>
>>> The order-preserving partitioner will use keys as tokens. The type you're
>>> talking about could be the column type but that's another thing.
>>>
>>>
>>
>


-- 
Nguyen Minh Kha

NCT Corporation
Email : khanm@nct.vn
Mobile : 090 696 1314
Y!M : iminhkha

Mime
View raw message