貌似必须要子类去extends ArrayWritable,不能直接用
java.lang.Exception: java.lang.RuntimeException: java.lang.NoSuchMethodException: org.apache.hadoop.io.ArrayWritable.<init>()
貌似必须要子类去extends ArrayWritable,不能直接用
java.lang.Exception: java.lang.RuntimeException: java.lang.NoSuchMethodException: org.apache.hadoop.io.ArrayWritable.<init>()