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

java.lang.Object
  org.apache.hadoop.hive.ql.exec.Task<MapredLocalWork>
      org.apache.hadoop.hive.ql.exec.MapredLocalTask

All Implemented Interfaces:

Serializable, Node

public class MapredLocalTask
extends Task<MapredLocalWork>
implements Serializable

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.Task

Task.FeedType

Field Summary

protected HadoopJobExecHelper	jobExecHelper
static org.apache.commons.logging.Log	l4j
static MemoryMXBean	memoryMXBean

Fields inherited from class org.apache.hadoop.hive.ql.exec.Task

BACKUP_COMMON_JOIN, backupChildrenTasks, backupTask, childTasks, clonedConf, COMMON_JOIN, conf, console, CONVERTED_LOCAL_MAPJOIN, CONVERTED_MAPJOIN, db, driverContext, feedSubscribers, id, initialized, isdone, jobID, LOCAL_MAPJOIN, NO_TAG, parentTasks, queryPlan, queued, started, taskCounters, taskHandle, taskTag, work

Constructor Summary

MapredLocalTask()

MapredLocalTask(MapredLocalWork plan, org.apache.hadoop.mapred.JobConf job, boolean isSilent)

Method Summary

int	execute(DriverContext driverContext) This method is overridden in each Task.
int	executeFromChildJVM(DriverContext driverContext)
String	getName() Gets the name of the node.
Collection<Operator<? extends OperatorDesc>>	getTopOperators()
StageType	getType() Should be overridden to return the type of the specific task among the types in StageType.
void	initialize(HiveConf conf, QueryPlan queryPlan, DriverContext driverContext)
boolean	isMapRedLocalTask()
void	localizeMRTmpFilesImpl(Context ctx) If this task uses any map-reduce intermediate data (either for reading or for writing), localize them (using the supplied Context).
static String	now()
boolean	requireLock()

Methods inherited from class org.apache.hadoop.hive.ql.exec.Task

addDependentTask, cloneConf, done, executeTask, fetch, getAndInitBackupTask, getBackupChildrenTasks, getBackupTask, getChildren, getChildTasks, getCounters, getDependentTasks, getFeedSubscribers, getId, getInitialized, getJobID, getParentTasks, getQueryPlan, getQueued, getReducer, getResultSchema, getTaskTag, getWork, hasReduce, ifRetryCmdWhenFail, isLocalMode, isMapRedTask, isRunnable, localizeMRTmpFiles, pushFeed, receiveFeed, removeDependentTask, removeFromChildrenTasks, setBackupChildrenTasks, setBackupTask, setChildTasks, setDone, setFeedSubscribers, setId, setInitialized, setLocalMode, setParentTasks, setQueryPlan, setQueued, setRetryCmdWhenFail, setStarted, setTaskTag, setWork, started, subscribeFeed

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

jobExecHelper

protected HadoopJobExecHelper jobExecHelper

l4j

public static final transient org.apache.commons.logging.Log l4j

memoryMXBean

public static MemoryMXBean memoryMXBean

Constructor Detail

MapredLocalTask

public MapredLocalTask()

MapredLocalTask

public MapredLocalTask(MapredLocalWork plan,
                       org.apache.hadoop.mapred.JobConf job,
                       boolean isSilent)
                throws HiveException

Throws:

HiveException

Method Detail

initialize

public void initialize(HiveConf conf,
                       QueryPlan queryPlan,
                       DriverContext driverContext)

Overrides:

initialize in class Task<MapredLocalWork>

now

public static String now()

requireLock

public boolean requireLock()

Overrides:

requireLock in class Task<MapredLocalWork>

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<MapredLocalWork>

Returns:

status of executing the task

executeFromChildJVM

public int executeFromChildJVM(DriverContext driverContext)

localizeMRTmpFilesImpl

public void localizeMRTmpFilesImpl(Context ctx)

Description copied from class: Task

If this task uses any map-reduce intermediate data (either for reading or for writing), localize them (using the supplied Context). Map-Reduce intermediate directories are allocated using Context.getMRTmpFileURI() and can be localized using localizeMRTmpFileURI(). This method is declared abstract to force any task code to explicitly deal with this aspect of execution.

Specified by:

localizeMRTmpFilesImpl in class Task<MapredLocalWork>

Parameters:

ctx - context object with which to localize

isMapRedLocalTask

public boolean isMapRedLocalTask()

Overrides:

isMapRedLocalTask in class Task<MapredLocalWork>

getTopOperators

public Collection<Operator<? extends OperatorDesc>> getTopOperators()

Overrides:

getTopOperators in class Task<MapredLocalWork>

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

getType

public StageType getType()

Description copied from class: Task

Should be overridden to return the type of the specific task among the types in StageType.

Specified by:

getType in class Task<MapredLocalWork>

Returns:

StageType.* or null if not overridden