Example usage for org.apache.hadoop.mapreduce TaskID getTaskType

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce TaskID getTaskType.

Prototype

public static TaskType getTaskType(char c) 

Source Link

Document

Gets the TaskType corresponding to the character.

Usage

From source file:org.apache.giraph.yarn.GiraphYarnTask.java

License:Apache License

/**
 * Utility to create a TaskAttemptId we can feed to our fake Mapper#Context.
 *
 * NOTE: ContainerId will serve as MR TaskID for Giraph tasks.
 * YARN container 1 is always AppMaster, so the least container id we will
 * ever get from YARN for a Giraph task is container id 2. Giraph on MapReduce
 * tasks must start at index 0. So we SUBTRACT TWO from each container id.
 *
 * @param args the command line args, fed to us by GiraphApplicationMaster.
 * @return the TaskAttemptId object, populated with YARN job data.
 *//*from  w w  w  .j  av  a2s  . c o  m*/
private static TaskAttemptID getTaskAttemptID(String[] args) {
    return new TaskAttemptID(args[0], // YARN ApplicationId Cluster Timestamp
            Integer.parseInt(args[1]), // YARN ApplicationId #
            TaskID.getTaskType('m'), // Make Giraph think this is a Mapper task.
            Integer.parseInt(args[2]) - 2, // YARN ContainerId MINUS TWO (see above)
            Integer.parseInt(args[3])); // YARN AppAttemptId #
}

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