Cassandra和HDFS都在内部使用番石榴，但由于各种原因，它们都没有使用番石榴。因为番石榴的版本不是二进制兼容的，所以我在运行时找到了NoSuchMethodError。
我试图在build.sbt：
val HadoopVersion = "2.6.0-cdh5.11.0"
// ...
val hadoopHdfs = "org.apache.hadoop" % "hadoop-hdfs" % HadoopVersion
val hadoopCommon = "org.apache.hadoop" % "hadoop-common" % HadoopVersion
val hadoopHdfsTest = "org.apache.hadoop" % "hadoop-hdfs" % HadoopVersion % "test" classifier "tests"
val hadoopCommonTest = "org.apache.hadoop" % "hadoop-common" % HadoopVersion % "test" classifier "tests"
val hadoopMiniDFSCluster = "org.apache.hadoop" % "hadoop-minicluster" % HadoopVersion % Test
// ...
assemblyShadeRules in assembly := Seq(
ShadeRule.rename("com.google.common.**" -> "shade.com.google.common.@1").inLibrary(hadoopHdfs).inProject,
ShadeRule.rename("com.google.common.**" -> "shade.com.google.common.@1").inLibrary(hadoopCommon).inProject,
ShadeRule.rename("com.google.common.**" -> "shade.com.google.common.@1").inLibrary(hadoopHdfsTest).inProject,
ShadeRule.rename("com.google.common.**" -> "shade.com.google.common.@1").inLibrary(hadoopCommonTest).inProject,
ShadeRule.rename("com.google.common.**" -> "shade.com.google.common.@1").inLibrary(hadoopMiniDFSCluster).inProject
)
assemblyJarName in assembly := s"${name.value}-${version.value}.jar"
assemblyMergeStrategy in assembly := {
case PathList("META-INF", "MANIFEST.MF") => MergeStrategy.discard
case _ => MergeStrategy.first
}
但是运行时异常仍然存在（哈 - 这是一个cassandra笑话，人们）。
具体例外是
[info] HdfsEntitySpec *** ABORTED ***
[info] java.lang.NoSuchMethodError: com.google.common.base.Objects.toStringHelper(Ljava/lang/Object;)Lcom/google/common/base/Objects$ToStringHelper;
[info] at org.apache.hadoop.metrics2.lib.MetricsRegistry.toString(MetricsRegistry.java:406)
[info] at java.lang.String.valueOf(String.java:2994)
[info] at java.lang.StringBuilder.append(StringBuilder.java:131)
[info] at org.apache.hadoop.ipc.metrics.RetryCacheMetrics.<init>(RetryCacheMetrics.java:46)
[info] at org.apache.hadoop.ipc.metrics.RetryCacheMetrics.create(RetryCacheMetrics.java:53)
[info] at org.apache.hadoop.ipc.RetryCache.<init>(RetryCache.java:202)
[info] at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initRetryCache(FSNamesystem.java:1038)
[info] at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:949)
[info] at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:796)
[info] at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1040)
[info] ...
如何正确遮挡番石榴以阻止运行时错误？
答案 0 :(得分：2)
着色规则仅适用于构建胖罐的情况。在其他sbt任务期间不会应用它。
如果你想在hadoop依赖项中隐藏一些库，你可以创建一个只包含hadoop依赖项的新项目，遮蔽库，并发布一个带有所有着色hadoop依赖项的胖jar。
这不是一个完美的解决方案，因为新的hadoop jar中的所有依赖项对于使用它们都是“未知”，并且您需要手动处理冲突。
以下是@using(Html.BeginForm("ActionName", "ControllerName"))
{
...
}
发布胖胖子jar所需的代码
（使用您的代码和sbt程序集docs）：
build.sbt我没有测试它，但这是它的要点。
我想指出另一个我注意到的问题，你的合并策略可能会给你带来问题，因为你想对某些文件应用不同的策略。请参阅默认策略here
我建议使用这样的东西来保留非val HadoopVersion = "2.6.0-cdh5.11.0"
val hadoopHdfs = "org.apache.hadoop" % "hadoop-hdfs" % HadoopVersion
val hadoopCommon = "org.apache.hadoop" % "hadoop-common" % HadoopVersion
val hadoopHdfsTest = "org.apache.hadoop" % "hadoop-hdfs" % HadoopVersion classifier "tests"
val hadoopCommonTest = "org.apache.hadoop" % "hadoop-common" % HadoopVersion % classifier "tests"
val hadoopMiniDFSCluster = "org.apache.hadoop" % "hadoop-minicluster" % HadoopVersion
lazy val fatJar = project
.enablePlugins(AssemblyPlugin)
.settings(
libraryDependencies ++= Seq(
hadoopHdfs,
hadoopCommon,
hadoopHdfsTest,
hadoopCommonTest,
hadoopMiniDFSCluster
),
assemblyShadeRules in assembly := Seq(
ShadeRule.rename("com.google.common.**" -> "shade.@0").inAll
),
assemblyMergeStrategy in assembly := {
case PathList("META-INF", "MANIFEST.MF") => MergeStrategy.discard
case _ => MergeStrategy.first
},
artifact in (Compile, assembly) := {
val art = (artifact in (Compile, assembly)).value
art.withClassifier(Some("assembly"))
},
addArtifact(artifact in (Compile, assembly), assembly),
crossPaths := false, // Do not append Scala versions to the generated artifacts
autoScalaLibrary := false, // This forbids including Scala related libraries into the dependency
skip in publish := true
)
lazy val shaded_hadoop = project
.settings(
name := "shaded-hadoop",
packageBin in Compile := (assembly in (fatJar, Compile)).value
)
deduplicate