spark + sbt-assembly：“去重：在下面找到不同的文件内容”

Question

我运行了 spark 应用程序并想将测试类打包到 fat jar 中。奇怪的是我成功地运行了“sbt assembly”，但是当我运行“sbt test:assembly”时却失败了。

我试过sbt-assembly : including test classes，但对我的情况不起作用。

SBT 版本：0.13.8

build.sbt:

import sbtassembly.AssemblyPlugin._

name := "assembly-test"

version := "1.0"

scalaVersion := "2.10.5"

libraryDependencies ++= Seq(
  ("org.apache.spark" % "spark-core_2.10" % "1.3.1" % Provided)
    .exclude("org.mortbay.jetty", "servlet-api").
    exclude("commons-beanutils", "commons-beanutils-core").
    exclude("commons-collections", "commons-collections").
    exclude("commons-logging", "commons-logging").
    exclude("com.esotericsoftware.minlog", "minlog").exclude("com.codahale.metrics", "metrics-core"),
  "org.json4s" % "json4s-jackson_2.10" % "3.2.10" % Provided,
  "com.google.inject" % "guice" % "4.0"
)

Project.inConfig(Test)(assemblySettings)

Answer 1

作为 Wesley Milano 答案的补充，代码需要针对 sbt-assembly 插件的较新版本（即 0.13.0）进行一些调整，以防有人对弃用警告感到疑惑：

assemblyMergeStrategy in assembly := {
    case PathList("javax", "servlet", xs @ _*) => MergeStrategy.last
    case PathList("javax", "activation", xs @ _*) => MergeStrategy.last
    case PathList("org", "apache", xs @ _*) => MergeStrategy.last
    case PathList("com", "google", xs @ _*) => MergeStrategy.last
    case PathList("com", "esotericsoftware", xs @ _*) => MergeStrategy.last
    case PathList("com", "codahale", xs @ _*) => MergeStrategy.last
    case PathList("com", "yammer", xs @ _*) => MergeStrategy.last
    case "about.html" => MergeStrategy.rename
    case "META-INF/ECLIPSEF.RSA" => MergeStrategy.last
    case "META-INF/mailcap" => MergeStrategy.last
    case "META-INF/mimetypes.default" => MergeStrategy.last
    case "plugin.properties" => MergeStrategy.last
    case "log4j.properties" => MergeStrategy.last
    case x =>
        val oldStrategy = (assemblyMergeStrategy in assembly).value
        oldStrategy(x)
}

Answer 2

您必须在程序集中定义 mergeStratey，就像我在下面为我的 spark 应用程序所做的那样。

mergeStrategy in assembly <<= (mergeStrategy in assembly) { (old) =>
  {
    case PathList("javax", "servlet", xs @ _*) => MergeStrategy.last
    case PathList("javax", "activation", xs @ _*) => MergeStrategy.last
    case PathList("org", "apache", xs @ _*) => MergeStrategy.last
    case PathList("com", "google", xs @ _*) => MergeStrategy.last
    case PathList("com", "esotericsoftware", xs @ _*) => MergeStrategy.last
    case PathList("com", "codahale", xs @ _*) => MergeStrategy.last
    case PathList("com", "yammer", xs @ _*) => MergeStrategy.last
    case "about.html" => MergeStrategy.rename
    case "META-INF/ECLIPSEF.RSA" => MergeStrategy.last
    case "META-INF/mailcap" => MergeStrategy.last
    case "META-INF/mimetypes.default" => MergeStrategy.last
    case "plugin.properties" => MergeStrategy.last
    case "log4j.properties" => MergeStrategy.last
    case x => old(x)
  }
}