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

java.lang.Object
  org.apache.hadoop.hive.ql.exec.Task<DDLWork>
      org.apache.hadoop.hive.ql.exec.DDLTask

All Implemented Interfaces:

Serializable, Node

public class DDLTask
extends Task<DDLWork>
implements Serializable

DDLTask 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, 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

DDLTask()

Method Summary

int	execute(DriverContext driverContext) This method is overridden in each Task.
String	getName() Gets the name of the node.
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 ctx)
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).
boolean	requireLock()
int	showColumns(Hive db, ShowColumnsDesc showCols)
static void	writeGrantInfo(DataOutput outStream, PrincipalType principalType, String principalName, String dbName, String tableName, String partName, String columnName, PrivilegeGrantInfo grantInfo)

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, getTopOperators, getWork, hasReduce, ifRetryCmdWhenFail, isLocalMode, isMapRedLocalTask, 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

Constructor Detail

DDLTask

public DDLTask()

Method Detail

requireLock

public boolean requireLock()

Overrides:

requireLock in class Task<DDLWork>

initialize

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

Overrides:

initialize in class Task<DDLWork>

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<DDLWork>

Returns:

status of executing the task

showColumns

public int showColumns(Hive db,
                       ShowColumnsDesc showCols)
                throws HiveException

Throws:

HiveException

writeGrantInfo

public static void writeGrantInfo(DataOutput outStream,
                                  PrincipalType principalType,
                                  String principalName,
                                  String dbName,
                                  String tableName,
                                  String partName,
                                  String columnName,
                                  PrivilegeGrantInfo grantInfo)
                           throws IOException

Throws:

IOException

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<DDLWork>

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

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<DDLWork>

Parameters:

ctx - context object with which to localize