我试图通过为我的项目运行sbt assembly来制作一个胖jar。我得到以下错误：

[error] (root/*:assembly) deduplicate: different file contents found in the following:
[error] /Users/xyz/.ivy2/cache/org.apache.hadoop/hadoop-mapreduce-client-core/jars/hadoop-mapreduce-client-core-2.2.0.jar:org/apache/hadoop/filecache/DistributedCache.class
[error] /Users/xyz/.ivy2/cache/org.apache.hadoop/hadoop-core/jars/hadoop-core-2.0.0-mr1-cdh4.7.1.jar:org/apache/hadoop/filecache/DistributedCache.class

hadoop mapreduce客户端核心的distributedcache现在不推荐使用。在my build.sbt中，我包括：

"org.apache.hadoop" % "hadoop-client" % "2.0.0-mr1-cdh4.7.1" excludeAll(
    ExclusionRule(organization = "javax.servlet"))

依赖关系如下：

org.apache.hadoop:hadoop-client:2.2.0 
 org.apache.hadoop:hadoop-mapreduce-client-app:2.2.0
  org.apache.hadoop:hadoop-mapreduce-client-core:2.2.0

我该怎么处理？
提前谢谢！