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

java.lang.Object
  org.apache.hadoop.hive.ql.exec.Task<ConditionalWork>
      org.apache.hadoop.hive.ql.exec.ConditionalTask

All Implemented Interfaces:

Serializable, Node

public class ConditionalTask
extends Task<ConditionalWork>
implements Serializable

Conditional Task implementation.

See Also:

Serialized Form

Nested Class Summary

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

Task.FeedType

Field Summary

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, LOG, NO_TAG, parentTasks, queryPlan, queued, started, taskCounters, taskHandle, taskTag, work

Constructor Summary

ConditionalTask()

Method Summary

boolean	addDependentTask(Task<? extends Serializable> dependent) Add a dependent task on the current conditional task.
boolean	done()
int	execute(DriverContext driverContext) This method is overridden in each Task.
List<Task<? extends Serializable>>	getDependentTasks() The default dependent tasks are just child tasks, but different types could implement their own (e.g.
List<Task<? extends Serializable>>	getListTasks()
String	getName() Gets the name of the node.
ConditionalResolver	getResolver()
Object	getResolverCtx()
StageType	getType() Should be overridden to return the type of the specific task among the types in StageType.
boolean	hasReduce()
void	initialize(HiveConf conf, QueryPlan queryPlan, DriverContext driverContext)
boolean	isMapRedTask()
protected 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).
void	setListTasks(List<Task<? extends Serializable>> listTasks)
void	setResolver(ConditionalResolver resolver)
void	setResolverCtx(Object resolverCtx)

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

cloneConf, executeTask, fetch, getAndInitBackupTask, getBackupChildrenTasks, getBackupTask, getChildren, getChildTasks, getCounters, getFeedSubscribers, getId, getInitialized, getJobID, getParentTasks, getQueryPlan, getQueued, getReducer, getResultSchema, getTaskTag, getTopOperators, getWork, ifRetryCmdWhenFail, isLocalMode, isMapRedLocalTask, isRunnable, localizeMRTmpFiles, pushFeed, receiveFeed, removeDependentTask, removeFromChildrenTasks, requireLock, 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

Constructor Detail

ConditionalTask

public ConditionalTask()

Method Detail

isMapRedTask

public boolean isMapRedTask()

Overrides:

isMapRedTask in class Task<ConditionalWork>

hasReduce

public boolean hasReduce()

Overrides:

hasReduce in class Task<ConditionalWork>

initialize

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

Overrides:

initialize in class Task<ConditionalWork>

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<ConditionalWork>

Returns:

status of executing the task

getResolver

public ConditionalResolver getResolver()

Returns:

the resolver

setResolver

public void setResolver(ConditionalResolver resolver)

Parameters:

resolver - the resolver to set

getResolverCtx

public Object getResolverCtx()

Returns:

the resolverCtx

done

public boolean done()

Overrides:

done in class Task<ConditionalWork>

setResolverCtx

public void setResolverCtx(Object resolverCtx)

Parameters:

resolverCtx - the resolverCtx to set

getListTasks

public List<Task<? extends Serializable>> getListTasks()

Returns:

the listTasks

setListTasks

public void setListTasks(List<Task<? extends Serializable>> listTasks)

Parameters:

listTasks - the listTasks to set

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<ConditionalWork>

Returns:

StageType.* or null 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

addDependentTask

public boolean addDependentTask(Task<? extends Serializable> dependent)

Add a dependent task on the current conditional task. The task will not be a direct child of conditional task. Actually it will be added as child task of associated tasks.

Overrides:

addDependentTask in class Task<ConditionalWork>

Returns:

true if the task got added false if it already existed

localizeMRTmpFilesImpl

protected 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<ConditionalWork>

Parameters:

ctx - context object with which to localize

getDependentTasks

public List<Task<? extends Serializable>> getDependentTasks()

Description copied from class: Task

The default dependent tasks are just child tasks, but different types could implement their own (e.g. ConditionalTask will use the listTasks as dependents).

Overrides:

getDependentTasks in class Task<ConditionalWork>

Returns:

a list of tasks that are dependent on this task.