问题 I am trying to run my first spark job (a Scala job that accesses Cassandra) which is failing and showing the following error : java.io.IOException: Failed to open native connection to Cassandra at {<ip>}:9042 at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:164) at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$2.apply(CassandraConnector.scala:150) at com.datastax.spark.connector