Why is guava not properly shaded in my build.sbt?

Question

tl; dr: Here is the repo containing the problem.

---

Cassandra and HDFS use the guava inside themselves, but none of them reflect dependency for various reasons. Since guava versions are not binary compatible, I find NoSuchMethodErrorat runtime.

I tried to obscure guava in my 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
}

but the runtime exception persists (ha is a joke of cassandra, people).

A specific exception is

[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]   ...

How can I properly shade guava to stop runtime errors?

Answer 1

, . sbt.

suoop, hadoop, .

, "", , .

, build.sbt, ( sbt docs):

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

assemblyMergeStrategy in assembly := {
          entry: String => {
            val strategy = (assemblyMergeStrategy in assembly).value(entry)
            if (strategy == MergeStrategy.deduplicate) MergeStrategy.first
            else strategy
          }
      }