scala 如何在 spark-shell 中运行外部 jar 函数
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How to run external jar functions in spark-shell
提问by reza
I created a jar package from a project by this file-tree:
我通过这个文件树从一个项目创建了一个 jar 包：
build.sbt
src/main
src/main/scala
src/main/scala/Tester.scala
src/main/scala/main.scala
where Tester is a class by a function (name is print()) and main has an object to run that prints "Hi!" (from spark documention) created a jar file by sbt successfully and worked well in spark-submit
其中 Tester 是一个函数的类（名称是 print()），main 有一个要运行的对象，它会打印“嗨！” （来自 spark 文档）通过 sbt 成功创建了一个 jar 文件并且在 spark-submit 中运行良好
now I wanna add it into spark-shell and use Tester class as a class to create objects and ... I added the jar file into spark-default.conf but:
现在我想将它添加到 spark-shell 并使用 Tester 类作为创建对象的类......我将 jar 文件添加到 spark-default.conf 但是：
scala> val t = new Tester();
<console>:23: error: not found: type Tester
val t = new Tester();
回答by Sandeep Purohit
you can try by providing jars with argument as below
您可以尝试通过提供带有参数的 jars 如下
./spark-shell --jars pathOfjarsWithCommaSeprated
Or you can add following configuration in you spark-defaults.conf but remember to remove template from end of spark-defaults
或者您可以在 spark-defaults.conf 中添加以下配置，但请记住从 spark-defaults 的末尾删除模板
spark.driver.extraClassPath pathOfJarsWithCommaSeprated
回答by Sam Malayek
If you want to add a .jar to the classpath after you've entered spark-shell, use :require. Like:
如果您想在进入 spark-shell 后将 .jar 添加到类路径，请使用:require. 喜欢：
scala> :require /path/to/file.jar
Added '/path/to/file.jar' to classpath.
回答by Priyanshu Singh
I tried two options and both worked for me.
我尝试了两种选择，都对我有用。
spark-shell --jars <path of jar>open spark-shell -Type :help,you will get all the available help. use below to add
:require /full_path_of_jar
spark-shell --jars <path of jar>打开 spark-shell -Type :help，您将获得所有可用的帮助。使用下面添加
:require /full_path_of_jar
