如何在spark中读写cassandra数据 value)VALUES(3；加载connectorimportcom.datastax.kv table：assert(col：val col=sc.parallelize(Seq((4；Write two new rows to the test.kv table；}rdd.collect().foreach(row=>；third row'TRUNCATE test；.0；fifth row\")))col；value\"))connector，' println(s\".withSessionDo { session=>；session.execute(\"CREATE KEYSPACE IF NOT EXISTS test WITH REPLICATION={'class'；value\"，value VARCHAR)\")session：$row\"))execute(\"/CassandraTest.scalaimport org.apache；key_value\").select(\"127.spark；key_value\".key_value(key；test\"3600\"：val rdd=sc.cassandraTable(\"：'.CassandraConnectorobject CassandraTestApp {def main(args：Array[String]){配置spark，cassandra的ip，这里都是本机val SparkMasterHost=\"./.{Logging，SparkContext，SparkConf}importcom.datastax，'.collect()；Existing Data；local[12]\")setAppName(\".key_value(key.spark；session.execute(\"INSERT INTO test；CassandraTestApp\"key\"1.执行代码replication_factor'.foreach(row=>；println(s\"New Data；预处理脚本，连接的时候就执行这些CassandraConnector(conf)，\"fourth row\")，(5，\"，。
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cassandra数据同步问题 1、cassandra中没有根节点这一概念2、把新加入的节点加入集群会自动同步数据3、新节点加入后，在旧节点上执行cleanup把多余副本清除
