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The only way to change the cluster builder is to implement a custom CassandraConnectionFactory but this shouldn't be neccessary. If the metrics reporter is not found it usually means all the dependencies for the Spark Cassandra Connector were not correctly placed on the classpath.
Usually this means that either the --packages command is not being used to pull the maven artifact. Using the packages command for spark-submit (or the corresponding spark conf option) would download the connector and all perquisite dependencies.
With DSE the dse-spark-dependencies maven package should be used.
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