Remove references to unsupported Hadoop versions

README.md

@@ -48,7 +48,7 @@ Hadoop, you must build Spark against the same version that your cluster runs.
 You can change the version by setting the `SPARK_HADOOP_VERSION` environment
 when building Spark.
 
-For Apache Hadoop versions 1.x, 0.20.x, Cloudera CDH MRv1, and other Hadoop
+For Apache Hadoop versions 1.x, Cloudera CDH MRv1, and other Hadoop
 versions without YARN, use:
 
     # Apache Hadoop 1.2.1

docs/building-with-maven.md

@@ -12,7 +12,7 @@ Building Spark using Maven Requires Maven 3 (the build process is tested with Ma
 
 To enable support for HDFS and other Hadoop-supported storage systems, specify the exact Hadoop version by setting the "hadoop.version" property. If unset, Spark will build against Hadoop 1.0.4 by default.
 
-For Apache Hadoop versions 1.x, 0.20.x, Cloudera CDH MRv1, and other Hadoop versions without YARN, use:
+For Apache Hadoop versions 1.x, Cloudera CDH MRv1, and other Hadoop versions without YARN, use:
 
     # Apache Hadoop 1.2.1
     $ mvn -Dhadoop.version=1.2.1 clean install

project/SparkBuild.scala

@@ -24,10 +24,9 @@ import AssemblyKeys._
 //import com.jsuereth.pgp.sbtplugin.PgpKeys._
 
 object SparkBuild extends Build {
-  // Hadoop version to build against. For example, "0.20.2", "0.20.205.0", or
-  // "1.0.4" for Apache releases, or "0.20.2-cdh3u5" for Cloudera Hadoop.
-  // Note that these variables can be set through the environment variables
-  // SPARK_HADOOP_VERSION and SPARK_WITH_YARN.
+  // Hadoop version to build against. For example, "1.0.4" for Apache releases, or
+  // "2.0.0-mr1-cdh4.2.0" for Cloudera Hadoop. Note that these variables can be set
+  // through the environment variables SPARK_HADOOP_VERSION and SPARK_WITH_YARN.
   val DEFAULT_HADOOP_VERSION = "1.0.4"
   val DEFAULT_WITH_YARN = false