org.apache.hadoop.hive.ql
Class Driver

java.lang.Object
  org.apache.hadoop.hive.ql.Driver

All Implemented Interfaces:

CommandProcessor

public class Driver
extends Object
implements CommandProcessor

Constructor Summary

Driver()

Driver(HiveConf conf)
for backwards compatibility with current tests

Driver(HiveConf conf, String userName)

Method Summary

int	close()
int	compile(String command) Compile a new query.
int	compile(String command, boolean resetTaskIds) Compile a new query, but potentially reset taskID counter.
CommandProcessorResponse	compileAndRespond(String command)
void	destroy()
int	execute()
org.apache.hadoop.mapred.ClusterStatus	getClusterStatus() Return the status information about the Map-Reduce cluster
String	getErrorMsg()
int	getMaxRows() Return the maximum number of rows returned by getResults
QueryPlan	getPlan()
Query	getQueryPlan()
boolean	getResults(List res)
Schema	getSchema()
static Schema	getSchema(BaseSemanticAnalyzer sem, HiveConf conf) Get a Schema with fields represented with native Hive types
Schema	getThriftSchema() Get a Schema with fields represented with Thrift DDL types
int	getTryCount()
boolean	hasReduceTasks(List<Task<? extends Serializable>> tasks)
void	init()
boolean	isFetchingTable()
void	resetFetch()
void	restoreSession(org.apache.hadoop.hive.ql.Driver.QueryState qs)
CommandProcessorResponse	run()
CommandProcessorResponse	run(String command)
CommandProcessorResponse	run(String command, boolean alreadyCompiled)
void	saveSession(org.apache.hadoop.hive.ql.Driver.QueryState qs)
void	setMaxRows(int maxRows) Set the maximum number of rows returned by getResults
void	setTryCount(int tryCount)

Methods inherited from class java.lang.Object

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

Constructor Detail

Driver

public Driver(HiveConf conf)

for backwards compatibility with current tests

Driver

public Driver(HiveConf conf,
              String userName)

Driver

public Driver()

Method Detail

init

public void init()

Specified by:

init in interface CommandProcessor

getClusterStatus

public org.apache.hadoop.mapred.ClusterStatus getClusterStatus()
                                                        throws Exception

Return the status information about the Map-Reduce cluster

Throws:

Exception

getSchema

public Schema getSchema()

getSchema

public static Schema getSchema(BaseSemanticAnalyzer sem,
                               HiveConf conf)

Get a Schema with fields represented with native Hive types

getThriftSchema

public Schema getThriftSchema()
                       throws Exception

Get a Schema with fields represented with Thrift DDL types

Throws:

Exception

getMaxRows

public int getMaxRows()

Return the maximum number of rows returned by getResults

setMaxRows

public void setMaxRows(int maxRows)

Set the maximum number of rows returned by getResults

hasReduceTasks

public boolean hasReduceTasks(List<Task<? extends Serializable>> tasks)

compile

public int compile(String command)

Compile a new query. Any currently-planned query associated with this Driver is discarded. Do not reset id for inner queries(index, etc). Task ids are used for task identity check.

Parameters:

command - The SQL query to compile.

saveSession

public void saveSession(org.apache.hadoop.hive.ql.Driver.QueryState qs)

restoreSession

public void restoreSession(org.apache.hadoop.hive.ql.Driver.QueryState qs)

compile

public int compile(String command,
                   boolean resetTaskIds)

Compile a new query, but potentially reset taskID counter. Not resetting task counter is useful for generating re-entrant QL queries.

Parameters:

command - The HiveQL query to compile

resetTaskIds - Resets taskID counter if true.

Returns:

0 for ok

getPlan

public QueryPlan getPlan()

Returns:

The current query plan associated with this Driver, if any.

run

public CommandProcessorResponse run(String command)
                             throws CommandNeedRetryException

Specified by:

run in interface CommandProcessor

Throws:

CommandNeedRetryException

run

public CommandProcessorResponse run()
                             throws CommandNeedRetryException

Throws:

CommandNeedRetryException

run

public CommandProcessorResponse run(String command,
                                    boolean alreadyCompiled)
                             throws CommandNeedRetryException

Throws:

CommandNeedRetryException

compileAndRespond

public CommandProcessorResponse compileAndRespond(String command)

execute

public int execute()
            throws CommandNeedRetryException

Throws:

CommandNeedRetryException

isFetchingTable

public boolean isFetchingTable()

getResults

public boolean getResults(List res)
                   throws IOException,
                          CommandNeedRetryException

Throws:

IOException

CommandNeedRetryException

resetFetch

public void resetFetch()
                throws IOException

Throws:

IOException

getTryCount

public int getTryCount()

setTryCount

public void setTryCount(int tryCount)

close

public int close()

destroy

public void destroy()

getQueryPlan

public Query getQueryPlan()
                   throws IOException

Throws:

IOException

getErrorMsg

public String getErrorMsg()