1) We’ve tested 100 threads in parallel and each thread created 10 tables. I think we will change our data model, but another problem may occur. About 80% of these CFs should be truncated every day and if we decrease many CF by creating one key field in one CF, a huge amount of tombstones will appear. What do think about it? 2) Tables appear with delay. Driver switches connections by Round-Robin. I think that CF was created in one node and after a moment the data was inserted in another node. And schema doesn't have time to synchronize.
2013/4/28 aaron morton <aa...@thelastpickle.com> > At first many CF are being created in parallel (about 1000 CF). > > Can you explain this in a bit more detail ? By in parallel do you mean > multiple threads creating CF's at the same time ? > > I would also recommend taking a second look at your data model, you > probably do not want to create so many CF's. > > > During tests we're receiving some exceptions from driver, e.g.: > > The CF you are trying to read / write from does not exist. Check if the > table exists using cqlsh / cassandra-cli. > > Check your code to make sure it was created. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 26/04/2013, at 10:49 PM, Sasha Yanushkevich <yanus...@gmail.com> wrote: > > Hi All > > > We are testing Cassandra 1.2.3 (3 nodes with RF:2) with FluentCassandra > driver. At first many CF are being created in parallel (about 1000 CF). After > creation is done follows many insertions of little amount of data into the > DB. During tests we're receiving some exceptions from driver, e.g.: > > > FluentCassandra.Operations.CassandraOperationException: unconfigured > columnfamily table_78_9 > and > > FluentCassandra.Operations.CassandraOperationException: Connection to > Cassandra has timed out > > Though in Cassandra's logs there are no exceptions. > > What should we do to handle these exceptions? > -- > Best regards, > Alexander > > > -- Best regards, Alexander
