org.apache.hadoop.hive.ql.exec
Class MapRedTask

java.lang.Object
  extended by org.apache.hadoop.hive.ql.exec.Task<MapredWork>
      extended by org.apache.hadoop.hive.ql.exec.MapRedTask
All Implemented Interfaces:
Serializable, Node

public class MapRedTask
extends Task<MapredWork>
implements Serializable

Alternate implementation (to ExecDriver) of spawning a mapreduce task that runs it from a separate jvm. The primary issue with this is the inability to control logging from a separate jvm in a consistent manner

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.apache.hadoop.hive.ql.exec.Task
childTasks, conf, console, db, driverContext, id, initialized, isdone, LOG, parentTasks, queryPlan, queued, started, taskCounters, taskHandle, work
 
Constructor Summary
MapRedTask()
           
 
Method Summary
 int execute(DriverContext driverContext)
          This method is overridden in each Task.
 String getName()
          Gets the name of the node.
 int getType()
          Should be overridden to return the type of the specific task among the types in TaskType.
 boolean hasReduce()
           
 boolean isMapRedTask()
           
 
Methods inherited from class org.apache.hadoop.hive.ql.exec.Task
addDependentTask, done, executeTask, fetch, getChildren, getChildTasks, getCounters, getDependentTasks, getId, getInitialized, getParentTasks, getQueued, getWork, initialize, isRunnable, progress, removeDependentTask, setChildTasks, setDone, setId, setInitialized, setParentTasks, setQueued, setStarted, setWork, started, updateCounters
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MapRedTask

public MapRedTask()
Method Detail

execute

public int execute(DriverContext driverContext)
Description copied from class: Task
This method is overridden in each Task. TODO execute should return a TaskHandle.

Specified by:
execute in class Task<MapredWork>
Returns:
status of executing the task

isMapRedTask

public boolean isMapRedTask()
Overrides:
isMapRedTask in class Task<MapredWork>

hasReduce

public boolean hasReduce()
Overrides:
hasReduce in class Task<MapredWork>

getType

public int getType()
Description copied from class: Task
Should be overridden to return the type of the specific task among the types in TaskType.

Overrides:
getType in class Task<MapredWork>
Returns:
TaskTypeType.* or -1 if not overridden

getName

public String getName()
Description copied from interface: Node
Gets the name of the node. This is used in the rule dispatchers.

Specified by:
getName in interface Node
Returns:
String


Copyright © 2010 The Apache Software Foundation