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From Robert Coli <rc...@eventbrite.com>
Subject Re: delay/stall processing reads
Date Thu, 02 Jan 2014 22:15:38 GMT
(D'oh, missed your details in the PS.. :D)

I don't know whether the .NET client uses thrift or native protocol..

Re 2.0.2 in production :
https://engineering.eventbrite.com/what-version-of-cassandra-should-i-run/

=Rob


On Thu, Jan 2, 2014 at 2:13 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Thu, Jan 2, 2014 at 2:05 PM, Thunder Stumpges <
> thunder.stumpges@gmail.com> wrote:
>
>> I am seeing a read operation delay in our small (3 node) cluster where I
>> am testing. The "normal" latency for these operations is < 2ms as recorded
>> by our load client. This holds easily beyond several hundred qps. However
>> there are times when all incoming queries (on a node-by-node basis) are
>> stalled anywhere from ~100-500ms, and then all "clear" and return at the
>> same time. This behavior is independent of the amount of load applied; Just
>> more queries get stalled at higher loads :). It seems like a "stall"
>> condition happens maybe every 30 seconds or so.
>>
>
> What version of cassandra, what configuration for thrift server if
> relevant, what protocol being used?
>
> The JVM can be expected to pause for 100-500ms while doing GC, cassandra
> logs the various GC types, what do you see in those logs? What does
> "nodetool tpstats" say when it happens?
>
> =Rob
>
>

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