scala - 在 Scala IDE 中运行简单的 Spark 代码

Question

我想使用 Scala IDE 并在 Windows 7 上运行 spark 代码。我已经安装了 Scala IDE 并开始创建一个 Scala 项目。所以我需要知道:

是否有任何指令可以在 Scala IDE 中运行以下代码:

/* SimpleApp.scala */
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf

object SimpleApp {
  def main(args: Array[String]) {
    val logFile = "D:/Spark_Installation/eclipse-ws/Scala/README.md" // Should be some file on your system
    val conf = new SparkConf().setAppName("Simple Application")
                              .setMaster("spark://myhost:7077")
    val sc = new SparkContext(conf)
    val logData = sc.textFile(logFile, 2).cache()
    val numAs = logData.filter(line => line.contains("a")).count()
    val numBs = logData.filter(line => line.contains("b")).count()
    println("Lines with a: %s, Lines with b: %s".format(numAs, numBs))
  }
}

当我运行此代码时，出现以下错误:

15/03/26 11:59:55 INFO AppClient$ClientActor: Connecting to master akka.tcp://sparkMaster@myhost:7077/user/Master...
15/03/26 11:59:58 WARN AppClient$ClientActor: Could not connect to akka.tcp://sparkMaster@myhost:7077: akka.remote.InvalidAssociation: Invalid address: akka.tcp://sparkMaster@myhost:7077
15/03/26 11:59:58 WARN Remoting: Tried to associate with unreachable remote address [akka.tcp://sparkMaster@myhost:7077]. Address is now gated for 5000 ms, all messages to this address will be delivered to dead letters. Reason: myhost
15/03/26 12:00:15 INFO AppClient$ClientActor: Connecting to master akka.tcp://sparkMaster@myhost:7077/user/Master...
15/03/26 12:00:17 WARN AppClient$ClientActor: Could not connect to akka.tcp://sparkMaster@myhost:7077: akka.remote.InvalidAssociation: Invalid address: akka.tcp://sparkMaster@myhost:7077
15/03/26 12:00:17 WARN Remoting: Tried to associate with unreachable remote address [akka.tcp://sparkMaster@myhost:7077]. Address is now gated for 5000 ms, all messages to this address will be delivered to dead letters. Reason: myhost
15/03/26 12:00:35 INFO AppClient$ClientActor: Connecting to master akka.tcp://sparkMaster@myhost:7077/user/Master...
15/03/26 12:00:37 WARN AppClient$ClientActor: Could not connect to akka.tcp://sparkMaster@myhost:7077: akka.remote.InvalidAssociation: Invalid address: akka.tcp://sparkMaster@myhost:7077
15/03/26 12:00:37 WARN Remoting: Tried to associate with unreachable remote address [akka.tcp://sparkMaster@myhost:7077]. Address is now gated for 5000 ms, all messages to this address will be delivered to dead letters. Reason: myhost
15/03/26 12:00:55 ERROR SparkDeploySchedulerBackend: Application has been killed. Reason: All masters are unresponsive! Giving up.
15/03/26 12:00:55 ERROR TaskSchedulerImpl: Exiting due to error from cluster scheduler: All masters are unresponsive! Giving up.
15/03/26 12:00:55 WARN SparkDeploySchedulerBackend: Application ID is not initialized yet.

Answer 1

你有设置 Spark 大师吗？如果没有，看看这个:
http://spark.apache.org/docs/1.2.1/submitting-applications.html#master-urls

你最想使用

local[*]

这将使用您本地计算机拥有的每个核心，而不是使用:

spark://myhost:7077

spark://假设您在 myhost:7077 上有一个 spark master 设置