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From Schubert Zhang <zson...@gmail.com>
Subject Re: Cassandra vs HBase
Date Fri, 04 Sep 2009 06:25:51 GMT
@stack,

inline

On Thu, Sep 3, 2009 at 3:15 PM, stack <stack@duboce.net> wrote:

>
> When does data expire?  Or, how many Billions of rows should your cluster
> of
> 10-20 nodes carry at a time?


about 3 months.
hundreds of billinons of rows.


>
> Will the many rows of same timestamp all go into the one timestamp row or
> will the key have a further qualifier such as event type to distingush
> amongst the updates that arrive at the same timestamp?
>

will have many rows of same timestamp.
we coud distingush row by using other info, if there is no such info in raw
data,we may should generate a unique id when pre-pressing phase.


>
> What do you see the as approximate write rate and what do you think its
> spread across timestamps will be?  E.g. 10000 updates a second and all of
> the updates fit within a ten second window?
>

in avg, about 40000 new rows per second.



> Sorry for all the questions.
>
> St.Ack
>

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