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我正在嘗試用Cassandra做java Spark流式傳輸。我已經對Scala做過同樣的事情,但我不知道如何繼續使用Java。網絡沒有給我任何java火花流和Cassandra的例子。用Cassandra進行Java Spark流式傳輸
能有一個人請告訴我如何有下面的Scala代碼在Java中:
import org.apache.spark.streaming.dstream.ConstantInputDStream
val ssc = new StreamingContext(conf, Seconds(10))
val cassandraRDD = ssc.cassandraTable("mykeyspace", "users").select("fname", "lname").where("lname = ?", "yu")
val dstream = new ConstantInputDStream(ssc, cassandraRDD)
dstream.foreachRDD{ rdd =>
// any action will trigger the underlying cassandra query, using collect to have a simple output
println(rdd.collect.mkString("\n"))
}
ssc.start()
ssc.awaitTermination()
任何幫助表示讚賞。謝謝
這些都是我的import語句 進口靜態com.datastax.spark.connector.japi.CassandraJavaUtil.javaFunctions; import static com.datastax.spark.connector.japi.CassandraJavaUtil.mapToRow; –