Ah. TimeUUID. Not as useful for you then but still something for the toolbox.
On Mar 27, 2013, at 8:42 AM, Lanny Ripple <la...@spotright.com> wrote:
> A type 4 UUID can be created from two Longs. You could MD5 your strings
> giving you 128 hashed bits and then make UUIDs out of that. Using Scala:
>
> import java.nio.ByteBuffer
> import java.security.MessageDigest
> import java.util.UUID
>
> val key = "Hello, World!"
>
> val md = MessageDigest.getInstance("MD5")
> val dig = md.digest(key.getBytes("UTF-8"))
> val bb = ByteBuffer.wrap(dig)
>
> val msb = bb.getLong
> val lsb = bb.getLong
>
> val uuid = new UUID(msb, lsb)
>
>
> On Mar 26, 2013, at 3:22 PM, aaron morton <aa...@thelastpickle.com> wrote:
>
>>> Any idea?
>> Not off the top of my head.
>>
>> Cheers
>>
>> -----------------
>> Aaron Morton
>> Freelance Cassandra Consultant
>> New Zealand
>>
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 26/03/2013, at 2:13 AM, Carlos Pérez Miguel <cperez...@gmail.com> wrote:
>>
>>> Yes it does. Thank you Aaron.
>>>
>>> Now I realized that the system keyspace uses string as keys, like "Ring" or
>>> "ClusterName", and I don't know how to convert these type of keys into
>>> UUID. Any idea?
>>>
>>>
>>> Carlos Pérez Miguel
>>>
>>>
>>> 2013/3/25 aaron morton <aa...@thelastpickle.com>
>>> The best thing to do is start with a look at ByteOrderedPartitoner and
>>> AbstractByteOrderedPartitioner.
>>>
>>> You'll want to create a new TimeUUIDToken extends Token<UUID> and a new
>>> UUIDPartitioner that extends AbstractPartitioner<>
>>>
>>> Usual disclaimer that ordered partitioners cause problems with load
>>> balancing.
>>>
>>> Hope that helps.
>>>
>>> -----------------
>>> Aaron Morton
>>> Freelance Cassandra Consultant
>>> New Zealand
>>>
>>> @aaronmorton
>>> http://www.thelastpickle.com
>>>
>>> On 25/03/2013, at 1:12 AM, Carlos Pérez Miguel <cperez...@gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> I store in my system rows where the key is a UUID version1, TimeUUID. I
>>>> would like to maintain rows ordered by time. I know that in this case, it
>>>> is recomended to use an external CF where column names are UUID ordered by
>>>> time. But in my use case this is not possible, so I would like to use a
>>>> custom Partitioner in order to do this. If I use ByteOrderedPartitioner
>>>> rows are not correctly ordered because of the way a UUID stores the
>>>> timestamp. What is needed in order to implement my own Partitioner?
>>>>
>>>> Thank you.
>>>>
>>>> Carlos Pérez Miguel
>>>
>>>
>>
>
