类 org.apache.hadoop.mapreduce.ID
的使用

使用ID的程序包

程序包	说明
org.apache.hadoop.mapred	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapreduce

org.apache.hadoop.mapred中ID的使用

org.apache.hadoop.mapred中ID的子类

限定符和类型	类和说明
class	ID A general identifier, which internally stores the id as an integer.

org.apache.hadoop.mapreduce中ID的使用

org.apache.hadoop.mapreduce中ID的子类

限定符和类型	类和说明
class	JobID JobID represents the immutable and unique identifier for the job.
class	TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
class	TaskID TaskID represents the immutable and unique identifier for a Map or Reduce Task.

参数类型为ID的org.apache.hadoop.mapreduce中的方法

限定符和类型	方法和说明
int	TaskID.compareTo(ID o) Compare TaskInProgressIds by first jobIds, then by tip numbers.
int	TaskAttemptID.compareTo(ID o) Compare TaskIds by first tipIds, then by task numbers.
int	JobID.compareTo(ID o) Compare JobIds by first jtIdentifiers, then by job numbers
int	ID.compareTo(ID that) Compare IDs by associated numbers