On Thu, Mar 25, 2010 at 5:57 AM, Jaepil Jeong wrote:
> Hi there,
> Thanks to all for reply. But I still have a question:
> 1. When I using Twtiter via Tweetie which is iPhone application, I can see
> the unique ID for each of users in their personal profile page. It seems
> like incremental number
On Thu, Mar 25, 2010 at 9:20 AM, Benjamin Black wrote:
> Cassandra is not being used to generate the Twitter identifiers.
> Twitter, like most places using Cassandra, has more than one database
> system in production.
>
> UUIDs are not at risk of conflicts with billions of rows.
Exactly: UUIDs we
Cassandra is not being used to generate the Twitter identifiers.
Twitter, like most places using Cassandra, has more than one database
system in production.
UUIDs are not at risk of conflicts with billions of rows.
b
On Thu, Mar 25, 2010 at 5:57 AM, Jaepil Jeong wrote:
> Hi there,
> Thanks to
Hi there,
Thanks to all for reply. But I still have a question:
1. When I using Twtiter via Tweetie which is iPhone application, I can see
the unique ID for each of users in their personal profile page. It seems
like incremental number. As far as I know, Twitter using Cassandra for its
back-end.
You replace it with an UUID. In a true scalable distributed system, you
should not have an auto_increment. If you are writing to 10
nodes simultaneously, it becomes near impossible to keep a single
incrementing value being used by the entire system without causing a lot of
write contention.
This i
- Where do you get the last inserted column from? - The first result of using
get_slice method of thrift, would be the super column with highest value in
the name, becouse the configuration of the column family of type super says
that the super columns will be decresent ordered (if Cassandra doesn'
It seems that this scheme would suffer under a race condition.
On Wed, Mar 24, 2010 at 11:00 AM, Jesus Ibanez wrote:
> You can generate UUIDs based on time with http://jug.safehaus.org/ if you
> use Java. And its easy to use, just have to insert one line:
> UUID uuid = UUIDGenerator.getInstance()
On Wed, Mar 24, 2010 at 11:00 AM, Jesus Ibanez wrote:
> You can generate UUIDs based on time with http://jug.safehaus.org/ if you
> use Java. And its easy to use, just have to insert one line:
> UUID uuid = UUIDGenerator.getInstance().generateTimeBasedUUID();
>
> Maybe a solution to your cuestion:
You can generate UUIDs based on time with http://jug.safehaus.org/ if you
use Java. And its easy to use, just have to insert one line:
UUID uuid = UUIDGenerator.getInstance().generateTimeBasedUUID();
Maybe a solution to your cuestion:
To "replace" the autoincrement of MySQL, you can create a colu
On Wed, Mar 24, 2010 at 6:22 PM, Jeremy Dunck wrote:
> http://en.wikipedia.org/wiki/Uuid
> ?
Yes sorry, I have copied the link from what google returned me, but it
was not the
right link apparently.
>
> On Wed, Mar 24, 2010 at 11:57 AM, Jaepil Jeong wrote:
>> Hi there,
>>
>> I just started rese
> How can I replace the "auto increament" attribute in MySQL
> with Cassandra?
You can't. Not easily at least.
> If I can't, how can I generate an ID which is globally
> unique for each of columns?
Check UUIDs:
http://en.wikipedia.org/wiki/Universally_Unique_Identifier
>
> Thanks,
>
> Sent from
http://en.wikipedia.org/wiki/Uuid
?
On Wed, Mar 24, 2010 at 11:57 AM, Jaepil Jeong wrote:
> Hi there,
>
> I just started research about Cassandra to replace MySQL, and I have a
> question: How can I replace the "auto increament" attribute in MySQL
> with Cassandra? If I can't, how can I generate
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