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, Task.TaskState

Field Summary

Fields

Modifier and Type	Field and Description
static String	DATABASE_PATH_SUFFIX Make qualified location for a database .

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

BACKUP_COMMON_JOIN, backupChildrenTasks, backupTask, childTasks, clonedConf, COMMON_JOIN, conf, console, CONVERTED_MAPJOIN, CONVERTED_MAPJOIN_LOCAL, CONVERTED_SORTMERGEJOIN, driverContext, feedSubscribers, HINTED_MAPJOIN, HINTED_MAPJOIN_LOCAL, id, jobID, MAPJOIN_ONLY_NOBACKUP, NO_TAG, parentTasks, queryDisplay, queryPlan, queryState, rootTask, taskCounters, taskHandle, taskTag, work

Constructor Summary

Constructors

Constructor and Description
DDLTask()

Method Summary

Modifier and Type	Method and Description
static StringBuilder	appendSerdeParams(StringBuilder builder, Map<String,String> serdeParam)
boolean	canExecuteInParallel()
static boolean	doesTableNeedLocation(Table tbl)
static void	dumpLockInfo(DataOutputStream os, org.apache.hadoop.hive.metastore.api.ShowLocksResponse rsp)
int	execute(DriverContext driverContext) This method is overridden in each Task.
String	getName() Gets the name of the node.
Task<? extends Serializable>	getSubtask()
org.apache.hadoop.hive.ql.plan.api.StageType	getType() Should be overridden to return the type of the specific task among the types in StageType.
void	initialize(QueryState queryState, QueryPlan queryPlan, DriverContext ctx, CompilationOpContext opContext)
static void	makeLocationQualified(String databaseName, Table table, HiveConf conf) Make location in specified sd qualified.
boolean	requireLock()
int	showColumns(Hive db, ShowColumnsDesc showCols) Write a list of the columns in the table to a file.
static void	validateSerDe(String serdeName, HiveConf conf) Check if the given serde is valid.

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

addDependentTask, cloneConf, done, equals, executeTask, findLeafs, getAndInitBackupTask, getBackupChildrenTasks, getBackupTask, getChildren, getChildTasks, getCounters, getDependentTasks, getDiagnosticsMessage, getDriverContext, getExternalHandle, getFeedSubscribers, getHive, getId, getInitialized, getJobID, getMapWork, getNumChild, getNumParent, getParentTasks, getQueryPlan, getQueryState, getQueued, getReducer, getStatusMessage, getTaskHandle, getTaskState, getTaskTag, getTopOperators, getTxnMgr, getWork, hashCode, hasReduce, isFetchSource, isLocalMode, isMapRedLocalTask, isMapRedTask, isNotInitialized, isRootTask, isRunnable, pushFeed, receiveFeed, removeDependentTask, removeFromChildrenTasks, setBackupChildrenTasks, setBackupTask, setChildTasks, setConf, setConsole, setDiagnosticMessage, setDone, setDriverContext, setException, setFeedSubscribers, setFetchSource, setId, setInitialized, setLocalMode, setParentTasks, setQueryDisplay, setQueryPlan, setQueued, setRootTask, setStarted, setState, setStatusMessage, setTaskTag, setWork, shutdown, started, subscribeFeed, toString, updateStatusInQueryDisplay, updateTaskMetrics

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

DATABASE_PATH_SUFFIX

public static final String DATABASE_PATH_SUFFIX

Make qualified location for a database .

See Also:

Constant Field Values

Constructor Detail

DDLTask

public DDLTask()

Method Detail

getSubtask

public Task<? extends Serializable> getSubtask()

requireLock

public boolean requireLock()

Overrides:

requireLock in class Task<DDLWork>

initialize

public void initialize(QueryState queryState,
                       QueryPlan queryPlan,
                       DriverContext ctx,
                       CompilationOpContext opContext)

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

appendSerdeParams

public static StringBuilder appendSerdeParams(StringBuilder builder,
                                              Map<String,String> serdeParam)

showColumns

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

Write a list of the columns in the table to a file.

Parameters:

db - The database in context.

showCols - A ShowColumnsDesc for columns we're interested in.

Returns:

Returns 0 when execution succeeds.

Throws:

HiveException - Throws this exception if an unexpected error occurs.

dumpLockInfo

public static void dumpLockInfo(DataOutputStream os,
                                org.apache.hadoop.hive.metastore.api.ShowLocksResponse rsp)
                         throws IOException

Throws:

IOException

validateSerDe

public static void validateSerDe(String serdeName,
                                 HiveConf conf)
                          throws HiveException

Check if the given serde is valid.

Throws:

HiveException

getType

public org.apache.hadoop.hive.ql.plan.api.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

makeLocationQualified

public static void makeLocationQualified(String databaseName,
                                         Table table,
                                         HiveConf conf)
                                  throws HiveException

Make location in specified sd qualified.

Parameters:

databaseName - Database name.

sd - Storage descriptor.

name - Object name.

Throws:

HiveException

doesTableNeedLocation

public static boolean doesTableNeedLocation(Table tbl)

canExecuteInParallel

public boolean canExecuteInParallel()

Overrides:

canExecuteInParallel in class Task<DDLWork>