cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ssivikt@gmail.com" <ssiv...@gmail.com>
Subject Re: Why "select count("*) from .." hangs ?
Date Tue, 25 Mar 2014 15:57:05 GMT
Hi,

What is your hardware, C* version, data structure and typical data size ?

On 03/25/2014 06:36 PM, shahab wrote:
> Hi,
>
> I am quite new to Cassandra and  trying to evaluate its feasibility 
> for our application.
> In our application, we need to insert roughly 300000 sensor data every 
> 30 seconds (basically we need to store time-series data).  I wrote a 
> simple java code to insert 300000 random data every 30 seconds for 10 
> iterations, and measured the number of  entries in the table after 
> each insertion.
> But after iteration 8,  (i.e. inserting  1500000 sensor data), the 
> "select count(') ...)  throws time-out exception and doesn't work 
> anymore. I even tried  to execute "select count(*)..." using Datastax 
> DevCenter GUI, but I got same result.
>
> I am sure that I have missed something or misunderstood how Cassandra 
> works, but don't know really what? I do appreciate any hints.
>
> best,
> /Shahab
>


Mime
View raw message