HI! I am trying to increase performance of COPY FROM by installing "*Cython <http://cython.org/> and libev <http://software.schmorp.de/pkg/libev.html> C extensions"* as described here: https://www.datastax.com/dev/blog/six-parameters-affecting-cqlsh-copy-from-performance .
My steps are as the following: 1. Install Cassandra 3.10, start it, add keyspace and table 2. Install C Extensions: sudo apt-get install gcc python-dev 3. Don't install Cython because as far as I understand it ships with C* 3 by default on step 1), so skip it 4. Install libev: sudo apt-get install libev4 libev-dev 5. Reinstall C* driver (because as far as I understand it shipped with C* on step 1): sudo pip install cassandra-driver 6. export CQLSH_NO_BUNDLED=TRUE 7. cqlsh to node and try COPY FROM And after all these steps above performance of COPY FROM is the same as before. I tested it with single node cluster and with multiple nodes cluster - it doesn't impact on performance. However, I see that COPY FROM is CPU bounded on my machines, so these steps should definitely increase the performance. The question: what I did wrong? Maybe some step is missed. How to check that COPY FROM really uses "*Cython <http://cython.org/> and libev <http://software.schmorp.de/pkg/libev.html> C extensions"* ?
