Question

我正试图以独立模式从spark中保存cassandra中的数据。通过运行以下命令：

  bin/spark-submit --packages datastax:spark-cassandra-connector:1.6.0-s_2.10
     --class "pl.japila.spark.SparkMeApp" --master local  /home/hduser2/code14/target/scala-2.10/simple-project_2.10-1.0.jar

我的build.sbt文件是： -

**name := "Simple Project"    
version := "1.0"     
scalaVersion := "2.10.4"      
libraryDependencies += "org.apache.spark" %% "spark-core" % "1.6.0"     
libraryDependencies += "org.apache.spark" %% "spark-sql" % "1.6.0"     
resolvers += "Spark Packages Repo" at "https://dl.bintray.com/spark-packages/maven"       
libraryDependencies += "datastax" % "spark-cassandra-connector" % "1.6.0-s_2.10"       
libraryDependencies ++= Seq(        
  "org.apache.cassandra" % "cassandra-thrift" % "3.5" ,      
  "org.apache.cassandra" % "cassandra-clientutil" % "3.5",      
  "com.datastax.cassandra" % "cassandra-driver-core" % "3.0.0"    
)**

我的Spark代码是： -

package pl.japila.spark     
import org.apache.spark.sql._    
import com.datastax.spark.connector._    
import com.datastax.driver.core._     
import com.datastax.spark.connector.cql._   
import org.apache.spark.{SparkContext, SparkConf}    
import com.datastax.driver.core.QueryOptions._    
import org.apache.spark.SparkConf    
import com.datastax.driver.core._   
import com.datastax.spark.connector.rdd._   

object SparkMeApp {
  def main(args: Array[String]) {

 val conf = new SparkConf(true).set("spark.cassandra.connection.host", "127.0.0.1")

  val sc = new SparkContext("local", "test", conf)    
  val sqlContext = new org.apache.spark.sql.SQLContext(sc)    
  val rdd = sc.cassandraTable("test", "kv")    
  val collection = sc.parallelize(Seq(("cat", 30), ("fox", 40)))

collection.saveToCassandra("test", "kv", SomeColumns("key", "value"))
  }
}

我收到了这个错误： -

线程中的异常＆＃34; main＆＃34; java.lang.NoSuchMethodError：com.datastax.driver.core.QueryOptions.setRefreshNodeIntervalMillis（I）Lcom / datastax / driver / core / QueryOptions; ** 在com.datastax.spark.connector.cql.DefaultConnectionFactory $ .clusterBuilder（CassandraConnectionFactory.scala：49）在com.datastax.spark.connector.cql.DefaultConnectionFactory $ .createCluster（CassandraConnectionFactory.scala：92） at com.datastax.spark.connector.cql.CassandraConnector $ .com $ datastax $ spark $ connector $ cql $ CassandraConnector $$ createSession（CassandraConnector.scala：153）在com.datastax.spark.connector.cql.CassandraConnector $$ anonfun $ 3.apply（CassandraConnector.scala：148）在com.datastax.spark.connector.cql.CassandraConnector $$ anonfun $ 3.apply（CassandraConnector.scala：148）在com.datastax.spark.connector.cql.RefCountedCache.createNewValueAndKeys（RefCountedCache.scala：31）在com.datastax.spark.connector.cql.RefCountedCache.acquire（RefCountedCache.scala：56）在com.datastax.spark.connector.cql.CassandraConnector.openSession（CassandraConnector.scala：81）在com.datastax.spark.connector.cql.CassandraConnector.withSessionDo（CassandraConnector.scala：109）

使用的版本是： -
Spark - 1.6.0
斯卡拉 - 2.10.4
cassandra-driver-core jar - 3.0.0
cassandra 2.2.7版 spark-cassandra连接器 - 1.6.0-s_2.10

有些人请帮忙！

Answer 1

我首先要删除

libraryDependencies ++= Seq(        
  "org.apache.cassandra" % "cassandra-thrift" % "3.5" ,      
  "org.apache.cassandra" % "cassandra-clientutil" % "3.5",      
  "com.datastax.cassandra" % "cassandra-driver-core" % "3.0.0"    
)

由于作为连接器依赖关系的库将自动包含在packages依赖项中。

然后我将通过使用

启动spark-shell来测试包的分辨率

./bin/spark-shell --packages datastax:spark-cassandra-connector:1.6.0-s_2.10

您看到以下决议正确发生

datastax#spark-cassandra-connector added as a dependency
:: resolving dependencies :: org.apache.spark#spark-submit-parent;1.0
        confs: [default]
        found datastax#spark-cassandra-connector;1.6.0-s_2.10 in spark-packages
        found org.apache.cassandra#cassandra-clientutil;3.0.2 in list
        found com.datastax.cassandra#cassandra-driver-core;3.0.0 in list
        ...
        [2.10.5] org.scala-lang#scala-reflect;2.10.5
:: resolution report :: resolve 627ms :: artifacts dl 10ms
        :: modules in use:
        com.datastax.cassandra#cassandra-driver-core;3.0.0 from list in [default]
        com.google.guava#guava;16.0.1 from list in [default]
        com.twitter#jsr166e;1.1.0 from list in [default]
        datastax#spark-cassandra-connector;1.6.0-s_2.10 from spark-packages in [default]
        ...

如果这些似乎解析正确但一切仍然无效，我会尝试清除这些工件的缓存。

Spark cassandra与spark-cassandra连接器集成时出错

1 个答案: