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
