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spark Cassandra connector 的df.save()写入Cassandra速度很慢，有什么调优的手段吗？
Spark Cassandra Connector的作者Russell Spitzer曾经做过一个讲座https://www.youtube.com/watch?v=cKIHRD6kUOc，slides在这里：https://www.slideshare.net/DataStax/maximum-overdrive-tuning-the-spark-cassandra-connector-russell-spitzer-datastax-c-summit-2016
里面有讲到不少调优的窍门，比如：Batching Key，Sorting，Turning off Batching When Beneficial，Having enough Data in a Task。
另外，这个开源项目的参考手册里提到的这些参数可以看一下：https://github.com/datastax/spark-cassandra-connector/blob/master/doc/reference.md#write-tuning-parameters
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