类 org.apache.hadoop.mapred.Task
的使用

使用Task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.server.tasktracker

org.apache.hadoop.mapred中Task的使用

返回Task的org.apache.hadoop.mapred中的方法

限定符和类型	方法和说明
Task	JvmTask.getTask()
Task	JobInProgress.obtainJobCleanupTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts, boolean isMapSlot) Return a CleanupTask, if appropriate, to run on the given tasktracker
Task	JobInProgress.obtainJobSetupTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts, boolean isMapSlot) Return a SetupTask, if appropriate, to run on the given tasktracker
Task	JobInProgress.obtainNewMapTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts) Return a MapTask, if appropriate, to run on the given tasktracker
Task	JobInProgress.obtainNewMapTaskCommon(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts, int maxCacheLevel) Return a MapTask with locality level that smaller or equal than a given locality level to tasktracker.
Task	JobInProgress.obtainNewNodeLocalMapTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts)
Task	JobInProgress.obtainNewNodeOrRackLocalMapTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts)
Task	JobInProgress.obtainNewNonLocalMapTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts)
Task	JobInProgress.obtainNewReduceTask(TaskTrackerStatus tts, int clusterSize, int numUniqueHosts) Return a ReduceTask, if appropriate, to run on the given tasktracker.
Task	JobInProgress.obtainTaskCleanupTask(TaskTrackerStatus tts, boolean isMapSlot)

类型变量类型为Task的org.apache.hadoop.mapred中的方法参数

限定符和类型	方法和说明
abstract void	TaskController.truncateLogsAsUser(String user, List<Task> allAttempts) Run the passed command as the user
void	DefaultTaskController.truncateLogsAsUser(String user, List<Task> allAttempts)

参数类型为Task的org.apache.hadoop.mapred中的构造器

构造器和说明
JvmTask(Task t, boolean shouldDie)

org.apache.hadoop.mapreduce.server.tasktracker中Task的使用

返回变量类型为Task的类型的org.apache.hadoop.mapreduce.server.tasktracker中的方法

限定符和类型	方法和说明
List<Task>	JVMInfo.getAllAttempts()

类型变量类型为Task的org.apache.hadoop.mapreduce.server.tasktracker中的构造器参数

构造器和说明
JVMInfo(File logLocation, List<Task> allAttempts)