create tbl (...) engine=cassandra ...
select smth from tbl;
try to repeat last query:
ERROR 1928 (HY000): Internal error: 'Thrift exception: write() send(): Broken pipe'
ERROR 1928 (HY000): Internal error: 'Thrift exception: Called write on non-open socket'
restart mysql service fixes problem.
and seems affected 10.0.2 too (at least looking in sources).