Merge pull request #558 from ash211/patch-jackson-conflict

Don't pull in old versions of Jackson via hadoop-core

project/SparkBuild.scala

@@ -131,7 +131,7 @@ object SparkBuild extends Build {
       "org.slf4j" % "slf4j-api" % slf4jVersion,
       "org.slf4j" % "slf4j-log4j12" % slf4jVersion,
       "com.ning" % "compress-lzf" % "0.8.4",
-      "org.apache.hadoop" % "hadoop-core" % HADOOP_VERSION,
+      "org.apache.hadoop" % "hadoop-core" % HADOOP_VERSION excludeAll( ExclusionRule(organization = "org.codehaus.jackson") ),
       "asm" % "asm-all" % "3.3.1",
       "com.google.protobuf" % "protobuf-java" % "2.4.1",
       "de.javakaffee" % "kryo-serializers" % "0.22",