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Date: Sun, 11 Apr 2010 10:09:34 +0300
Message-ID: <s2ra4f278e51004110009h8091308i57b4304f0374b6e9@mail.gmail.com>
Subject: Re: if cassandra isn't ideal for keep track of counts, how does digg
	count diggs?
From: Boris Shulman <shulmanb@gmail.com>
To: user@cassandra.apache.org
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What will be the latency for the zk based atomic increase?

On Tue, Apr 6, 2010 at 8:22 PM, Chris Goffinet <goffinet@digg.com> wrote:
> http://issues.apache.org/jira/browse/CASSANDRA-704
> http://issues.apache.org/jira/browse/CASSANDRA-721
> We have our own internal codebase of Cassandra at Digg. But we are using
> those above patches until we have the vector clock work cleaned up, that
> patch will also goto jira. Most likely the vector clock work will go into
> 0.7, but since we run 0.6 and built it for that version, we will share th=
at
> patch too.
> -Chris
> On Apr 6, 2010, at 10:17 AM, S Ahmed wrote:
>
> Chris,
> When you so patch, does that mean for Cassandra or your own internal
> codebase?
> Sounds interesting thanks!
>
> On Tue, Apr 6, 2010 at 12:54 PM, Chris Goffinet <goffinet@digg.com> wrote=
:
>>
>> That's not true. We have been using the Zookeper work we posted on jira.
>> That's what we are using internally and have been for months. We are now
>> just wrapping up our vector clocks + distributed counter patch so we can
>> begin transitioning away from the Zookeeper approach because there are
>> problems with it long-term.
>>
>> -Chris
>>
>> On Apr 6, 2010, at 9:50 AM, Ryan King wrote:
>>
>> > They don't use cassandra for it yet.
>> >
>> > -ryan
>> >
>> > On Tue, Apr 6, 2010 at 9:00 AM, S Ahmed <sahmed1020@gmail.com> wrote:
>> >> From what I read in another thread, Cassandra isn't used for isn't
>> >> 'ideal'
>> >> for keeping track of counts.
>> >> For example, I would undertand this to mean keeping track of which
>> >> stories
>> >> were dugg.
>> >> If this is true, how would a site like digg keep track of the 'dugg'
>> >> counter?
>> >> Also, I am assuming with eventual consistancy the number *may* not be
>> >> 100%
>> >> accurate. =A0If you wanted it to be accurate, would you just use the
>> >> Quorom
>> >> flag? (I believe quorom is to ensure all writes are written to disk)
>>
>
>
>