如何将数据从一个Cassandra数据库迁移到另一个数据库？

Question

I have two Cassandra databases in two different hosts. Both have tables with the exact same definition. How do I migrate data from one to the other?

SparkConf sparkConf = new SparkConf().setAppName(App.APP_NAME)
    .set("spark.cassandra.connection.host", App.CASSANDRA_HOST)
    .set("spark.cassandra.auth.username", "user")            
    .set("spark.cassandra.auth.password", "pass")
    .set("spark.cleaner.ttl", "3600");
SparkContext sparkContext = new SparkContext(sparkConf);

JavaRDD<EventLog> logs = javaFunctions(sparkContext)
    .cassandraTable("xyz", "event_log", mapRowTo(EventLog.class));
javaFunctions(logs).writerBuilder("xyz", "event_log", mapToRow(EventLog.class)).saveToCassandra();
sparkContext.stop();

In my Java code, I have read from the original DB and want to use the writerBuilder to write it into another DB. Where do I put the second DB's config and how do I write it there?

Answer 1

From the docs , there is a method

def withConnector(connector: CassandraConnector): WriterBuilder

Which you can call to pass in a different CassandraConnector object with the destination cluster information. This returns a new WriterBuilder which you would call saveToCassandra on.