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From rohit bhatia <rohit2...@gmail.com>
Subject Re: Row cache and counters
Date Sat, 29 Dec 2012 20:28:39 GMT
i assume u mean 8 seconds and not 8ms..
thats pretty huge to be caused by gc. Is there lot of load on your servers?
You might also need to check for memory contention

Regarding GC, since its parnew all u can really do is increase heap and
young gen size, or modify tenuring rate. But that can't be the reason for a
8 second timeout.


On Sat, Dec 29, 2012 at 11:37 PM, André Cruz <andre.cruz@co.sapo.pt> wrote:

> On 29/12/2012, at 16:59, rohit bhatia <rohit2412@gmail.com> wrote:
>
> Reads during a write still occur during a counter increment with CL ONE,
> but that latency is not counted in the request latency for the write. Your
> local node write latency of 45 microseconds is pretty quick. what is your
> timeout and the write request latency you see.
>
>
> Most of the time the increments are pretty quick, in the millisecond
> range. I have a 8s timeout and sometimes timeouts happen in bursts.
>
> In our deployment we had some issues and we could trace the timeouts to
> parnew gc collections which were quite frequent. You might just want to
> take a look there too.
>
>
> What can we do about that? Which settings did you tune?
>
> Thanks,
> André
>

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