org.apache.hadoop.hive.ql.exec
Class MapRedTask
java.lang.Object
org.apache.hadoop.hive.ql.exec.Task<mapredWork>
org.apache.hadoop.hive.ql.exec.MapRedTask
- All Implemented Interfaces:
- Serializable
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
Fields inherited from class org.apache.hadoop.hive.ql.exec.Task |
childTasks, conf, console, db, id, initialized, isdone, LOG, parentTasks, queryPlan, queued, started, taskCounters, taskHandle, work |
Method Summary |
int |
execute()
This method is overridden in each Task. |
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, getChildTasks, getCounters, 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 |
MapRedTask
public MapRedTask()
execute
public int execute()
- 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
Copyright © 2009 The Apache Software Foundation