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From Ertio Lew <ertio...@gmail.com>
Subject Re: Using a synchronized counter that keeps track of no of users on the application & using it to allot UserIds/ keys to the new users after sign up
Date Mon, 28 Feb 2011 15:41:12 GMT
Hi Ryan,

I am considering snowflake as an option for my usage with Cassandra
for a distributed application.
As I came to know snowflake uses 64 bits IDs. I am looking for a
solution that could help me generate 64 bits Ids
but in those 64 bits I would like at least 4 free bits so that I could
manipulate with those free bits to distinguish the two rows for a same
entity(split by kind of data) in same column family.

If I could keep the snowflake's Id size to around 60 bits, that would
be great for my use case. Is it possible to manipulate the bits safely
to around 60 bits? Perhaps the microsecond precision is not required
to that much depth for my use case.

Any kind of suggestions would be appreciated.

Best Regards
Ertio Lew







On Fri, Feb 4, 2011 at 1:09 AM, Ryan King <ryan@twitter.com> wrote:
> You could also consider snowflake:
>
> http://github.com/twitter/snowflake
>
> which gives you ids that roughly sort by time (but aren't sequential).
>
> -ryan
>
> On Thu, Feb 3, 2011 at 11:13 AM, Matthew E. Kennedy
> <matt.kennedy@spadac.com> wrote:
>> Unless you need your user identifiers to be sequential for some reason, I would save
yourself the headache of this kind of complexity and just use UUIDs if you have to generate
an identifier.
>>
>> On Feb 3, 2011, at 2:03 PM, Aklin_81 wrote:
>>
>>> Hi all,
>>> To generate new keys/ UserIds for new users on my application, I am
>>> thinking of using a simple synchronized counter that can keep track of
>>> the no. of users registered on my application and when a new user
>>> signs up, he can be allotted the next available id.
>>>
>>> Since Cassandra is eventually consistent, Is this advisable to
>>> implement with Cassandra, but then I could also use stronger
>>> consistency level like quorum or all for this purpose.
>>>
>>>
>>> Please let me know your thoughts and suggesttions..
>>>
>>> Regards
>>> Asil
>>
>>
>
>
>
> --
> @rk
>

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