Hi Aleksey, do you get a chance to take a look?

Thanks
Dikang.

On Thu, Mar 24, 2016 at 10:30 PM, Dikang Gu <dikan...@gmail.com> wrote:

> @Aleksey, sure, here is the jira:
> https://issues.apache.org/jira/browse/CASSANDRA-11432
>
> Thanks!
>
> On Thu, Mar 24, 2016 at 5:32 PM, Aleksey Yeschenko <alek...@apache.org>
> wrote:
>
>> Best open a JIRA ticket and I’ll have a look at what could be the reason.
>>
>> --
>> AY
>>
>> On 24 March 2016 at 23:20:55, Dikang Gu (dikan...@gmail.com) wrote:
>>
>> @Aleksey, we are writing to cluster with CL = 2, and reading with CL = 1.
>> And overall we have 6 copies across 3 different regions. Do you have
>> comments about our setup?
>>
>> During the repair, the counter value become inaccurate, we are still
>> playing with the repair, will keep you update with more experiments. But
>> do
>> you have any theory around that?
>>
>> Thanks a lot!
>> Dikang.
>>
>> On Thu, Mar 24, 2016 at 11:02 AM, Aleksey Yeschenko <alek...@apache.org>
>> wrote:
>>
>> > After repair is over, does the value settle? What CLs do you write to
>> your
>> > counters with? What CLs are you reading with?
>> >
>> > --
>> > AY
>> >
>> > On 24 March 2016 at 06:17:27, Dikang Gu (dikan...@gmail.com) wrote:
>> >
>> > Hello there,
>> >
>> > We are experimenting Counters in Cassandra 2.2.5. Our setup is that we
>> > have
>> > 6 nodes, across three different regions, and in each region, the
>> > replication factor is 2. Basically, each nodes holds a full copy of the
>> > data.
>> >
>> > When are doing 30k/s counter increment/decrement per node, and at the
>> > meanwhile, we are double writing to our mysql tier, so that we can
>> measure
>> > the accuracy of C* counter, compared to mysql.
>> >
>> > The experiment result was great at the beginning, the counter value in
>> C*
>> > and mysql are very close. The difference is less than 0.1%.
>> >
>> > But when we start to run the repair on one node, the counter value in
>> C*
>> > become much less than the value in mysql, the difference becomes larger
>> > than 1%.
>> >
>> > My question is that is it a known problem that the counter value will
>> > become under-counted if repair is running? Should we avoid running
>> repair
>> > for counter tables?
>> >
>> > Thanks.
>> >
>> > --
>> > Dikang
>> >
>> >
>>
>>
>> --
>> Dikang
>>
>>
>
>
> --
> Dikang
>
>


-- 
Dikang

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