@Override
  public Configuration getConfiguration(org.apache.hadoop.mapreduce.JobContext context) {
    return context.getConfiguration();
  }
Proxy file system also needs to override the access() method behavior.
Cannot add Override annotation since FileSystem.access() may not exist in
the version of hadoop used to build Hive.
shims/0.23/src/main/java/org/apache/hadoop/hive/shims/Hadoop23Shims.java