我已经为此苦苦挣扎了一段时间。我一直在尝试运行一个简单的 Twitter 情绪分析代码,该代码之前似乎工作正常但不再工作了。我正在使用 spark 1.3.1 和 scala 2.10.4。我在某处读到 TwitterUtils 不适用于 spark 1.0+,所以我尝试了一种解决方法。根据书籍,一切似乎都已到位.. scala 的正确目录结构,使用 sbt 程序集的胖 jar,正确的路径但不知何故 spark 无法获取 jar 文件,我也得到了一个 ClassNotFoundException。
可能出了什么问题,我该如何解决?
编辑:
命令行
../bin/spark-submit --class Sentimenter --master local[4] /home/ubuntu/spark/spark_examples/target/scala-2.10/twitter-sentiment-assembly-1.0.jar
错误:
Warning: Local jar /home/ubuntu/spark/spark_examples/target/scala-2.10/twitter-sentiment-assembly-1.0.jar does not exist, skipping.
java.lang.ClassNotFoundException: Sentimenter
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:538)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
build.sbt 文件:
lazy val root = (project in file(".")).
settings(
name := "twitter-sentiment",
version := "1.0",
scalaVersion := "2.10.4",
mainClass in Compile := Some("Sentimenter")
)
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "1.3.1" % "provided",
"org.apache.spark" %% "spark-streaming" % "1.3.1" % "provided",
"org.apache.spark" % "spark-streaming-twitter_2.11" % "1.3.1"
)
// META-INF discarding
val meta = """META.INF(.)*""".r
assemblyMergeStrategy in assembly := {
case PathList("javax", "servlet", xs @ _*) => MergeStrategy.first
case PathList(ps @ _*) if ps.last endsWith ".html" => MergeStrategy.first
case n if n.startsWith("reference.conf") => MergeStrategy.concat
case n if n.endsWith(".conf") => MergeStrategy.concat
case meta(_) => MergeStrategy.discard
case x => MergeStrategy.first`
这是我从另一个关于 Twitter 情绪的论坛获得的代码
import org.apache.spark.streaming.StreamingContext
import org.apache.spark.streaming.StreamingContext._
import org.apache.spark.SparkContext
import org.apache.spark.streaming.twitter._
import org.apache.spark.SparkConf
object Sentimenter {
def main(args: Array[String]) {
System.setProperty("twitter4j.oauth.consumerKey","xxxxxxxxxxxxx");
System.setProperty("twitter4j.oauth.consumerSecret","xxxxxxxxxxxx");
System.setProperty("twitter4j.oauth.accessToken","xxxxxxxxxxxx");
System.setProperty("twitter4j.oauth.accessTokenSecret","xxxxxxxxxx");
val filters = new Array[String](2)
filters(0) = "Big Data"
filters(1) = "geofencing"
val sparkConf = new SparkConf().setAppName("TweetSentiment").setMaster("local[4]").set("spark.driver.allowMultipleContexts", "true")
val sc = new SparkContext(sparkConf)
// get the list of positive words
val pos_list = sc.textFile("/home/ubuntu/spark/src/main/scala/Positive_Words.txt") //Random
.filter(line => !line.isEmpty())
.collect()
.toSet
// get the list of negative words
val neg_list = sc.textFile("/home/ubuntu/spark/src/main/scala/Negative_Words.txt") //Random
.filter(line => !line.isEmpty())
.collect()
.toSet
// create twitter stream
val ssc = new StreamingContext(sparkConf, Seconds(5))
val stream = TwitterUtils.createStream(ssc, None, filters)
val tweets = stream.map(r => r.getText)
tweets.print() // print tweet text
ssc.start()
ssc.awaitTermination()
}
}
最佳答案
我认为如果你写
../bin/spark-submit --class Sentimenter --master local[4] --jars/home/ubuntu/spark/spark_examples/target/scala-2.10/twitter-sentiment-assembly-1.0 .jar
或尝试重新排列 spark-submit 中的标志,例如:
../bin/spark-submit --jars/home/ubuntu/spark/spark_examples/target/scala-2.10/twitter-sentiment-assembly-1.0.jar --master local[4] -- Sentimenter 类
你可以让它工作。
关于java - 运行简单的 twitter 情绪分析代码时获取不存在的 jar 和 java.lang.ClassNotFoundException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31581006/