Reactive DSE Java Driver seeing high response times from Cassandra

[Shaurya Gupta <sh...@gmail.com>]

Hi

We are seeing high response times on the application side from the Java
Reactive DSE driver.
Cassandra server side metrics show response times of 2 ms but the DSE logs
show a response time (95th percentile) of 40ms.
Following
https://docs.datastax.com/en/developer/java-driver/4.2/manual/core/pooling/
it appears that the connections are open for sometime during a load run and
they go to 0, then again open-connections goes to the configured value
(4) + 1 and then again to 0.
Why is that ? Load run is at 30K RPM.
This happens even when I reduce the heartbeat interval to as low as 250
milliseconds.
The CPU consumed by the container is just 35% of available.

Can someone help with this ?

Thanks
-- 
Shaurya Gupta

Re: Reactive DSE Java Driver seeing high response times from Cassandra

[Dinesh Joshi <dj...@apache.org>]

Hi Shaurya,

I'm sorry but we don't maintain the DSE driver.

Dinesh

> On Jun 2, 2023, at 1:07 PM, Shaurya Gupta <sh...@gmail.com> wrote:
> 
> Hi
> 
> We are seeing high response times on the application side from the Java Reactive DSE driver.
> Cassandra server side metrics show response times of 2 ms but the DSE logs show a response time (95th percentile) of 40ms.
> Following https://docs.datastax.com/en/developer/java-driver/4.2/manual/core/pooling/ it appears that the connections are open for sometime during a load run and they go to 0, then again open-connections goes to the configured value (4) + 1 and then again to 0.
> Why is that ? Load run is at 30K RPM.
> This happens even when I reduce the heartbeat interval to as low as 250 milliseconds.
> The CPU consumed by the container is just 35% of available.
> 
> Can someone help with this ?
> 
> Thanks
> -- 
> Shaurya Gupta
> 
>