code: public CassandraSink<IN> disableChaining() {
  		if (useDataStreamSink) {
  			getSinkTransformation().setChainingStrategy(ChainingStrategy.NEVER);
  		} else {
  			getStreamTransformation().setChainingStrategy(ChainingStrategy.NEVER);
  		}
  		return this;
  	}
docs: Turns off chaining for this operator so thread co-location will not be
  used as an optimization.
  <p/>
  <p/>
  Chaining can be turned off for the whole
  job by {@link org.apache.flink.streaming.api.environment.StreamExecutionEnvironment#disableOperatorChaining()}
  however it is not advised for performance considerations.
  
  @return The sink with chaining disabled