Where is reduceByKey?

[Philip Ogren]

On the front page <http://spark.incubator.apache.org/> of the Spark 
website there is the following simple word count implementation:

file = spark.textFile("hdfs://...")
file.flatMap(line => line.split(" ")).map(word => (word, 
1)).reduceByKey(_ + _)

The same code can be found in the Quick Start 
<http://spark.incubator.apache.org/docs/latest/quick-start.html> quide.  
When I follow the steps in my spark-shell (version 0.8.0) it works 
fine.  The reduceByKey method is also shown in the list of 
transformations 
<http://spark.incubator.apache.org/docs/latest/scala-programming-guide.html#transformations> 
in the Spark Programming Guide.  The bottom of this list directs the 
reader to the API docs for the class RDD (this link is broken, BTW).  
The API docs for RDD 
<http://spark.incubator.apache.org/docs/latest/api/core/index.html#org.apache.spark.rdd.RDD> 
does not list a reduceByKey method for RDD. Also, when I try to compile 
the above code in a Scala class definition I get the following compile 
error:

value reduceByKey is not a member of 
org.apache.spark.rdd.RDD[(java.lang.String, Int)]

I am compiling with maven using the following dependency definition:

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.9.3</artifactId>
            <version>0.8.0-incubating</version>
        </dependency>

Can someone help me understand why this code works fine from the 
spark-shell but doesn't seem to exist in the API docs and won't compile?

Thanks,
Philip