类 org.apache.hadoop.mapred.join.JoinRecordReader
的使用

使用JoinRecordReader的程序包

程序包	说明
org.apache.hadoop.mapred.join	Given a set of sorted datasets keyed with the same class and yielding equal partitions, it is possible to effect a join of those datasets prior to the map.

org.apache.hadoop.mapred.join中JoinRecordReader的使用

org.apache.hadoop.mapred.join中JoinRecordReader的子类

限定符和类型	类和说明
class	InnerJoinRecordReader<K extends WritableComparable> Full inner join.
class	OuterJoinRecordReader<K extends WritableComparable> Full outer join.