org.apache.lens.server.api.query

Interface QueryExecutionService

All Superinterfaces:

HealthCheckable, LensService, SessionValidator

All Known Implementing Classes:

QueryExecutionServiceImpl

public interface QueryExecutionService
extends LensService, SessionValidator

The Interface QueryExecutionService.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME The Constant NAME.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	cancelQuery(LensSessionHandle sessionHandle, QueryHandle queryHandle) Cancel the execution of the query, specified by the handle.
void	closeResultSet(LensSessionHandle sessionHandle, QueryHandle queryHandle) Closes result set by releasing any resources used in serving the resultset.
boolean	destroyPrepared(LensSessionHandle sessionHandle, QueryPrepareHandle prepared) Destroy a prepared query.
QueryCost	estimate(String requestId, LensSessionHandle sessionHandle, String query, LensConf conf) Estimate the cost of given query.
QueryHandleWithResultSet	execute(LensSessionHandle sessionHandle, String query, long timeoutmillis, LensConf conf, String queryName) Execute the query with a timeout.
QueryHandle	executeAsync(LensSessionHandle sessionHandle, String query, LensConf conf, String queryName) Asynchronously execute the query.
QueryHandleWithResultSet	executePrepare(LensSessionHandle sessionHandle, QueryPrepareHandle prepareHandle, long timeoutmillis, LensConf conf, String queryName) Execute already prepared query with timeout.
QueryHandle	executePrepareAsync(LensSessionHandle sessionHandle, QueryPrepareHandle prepareHandle, LensConf conf, String queryName) Execute already prepared query asynchronously.
QueryPlan	explain(String requestId, LensSessionHandle sessionHandle, String query, LensConf conf) Explain the given query.
QueryPlan	explainAndPrepare(LensSessionHandle sessionHandle, String query, LensConf conf, String queryName) Explain the given query and prepare it as well.
QueryResult	fetchResultSet(LensSessionHandle sessionHandle, QueryHandle queryHandle, long startIndex, int fetchSize) Fetch the results of the query, specified by the handle.
List<QueryPrepareHandle>	getAllPreparedQueries(LensSessionHandle sessionHandle, String user, String queryName, String fromDate, String toDate) Returns all the prepared queries for the specified user.
List<QueryHandle>	getAllQueries(LensSessionHandle sessionHandle, String states, String user, String driver, String queryName, String fromDate, String toDate) Returns all the queries in the specified state, for the given user and matching query name.
long	getFinishedQueriesCount() Get finished queries count
javax.ws.rs.core.Response	getHttpResultSet(LensSessionHandle sessionHandle, QueryHandle queryHandle) Get the http end point for the result set.
long	getLaunchingQueriesCount() Get queries being launched count
LensPreparedQuery	getPreparedQuery(LensSessionHandle sessionHandle, QueryPrepareHandle prepareHandle) Get prepared query.
LensQuery	getQuery(LensSessionHandle sessionHandle, QueryHandle queryHandle) Get the query, specified by the handle.
long	getQueuedQueriesCount() Get queued queries count
QueryResultSetMetadata	getResultSetMetadata(LensSessionHandle sessionHandle, QueryHandle queryHandle) Get the result set metadata - list of columns(names and types) and result size.
long	getRunningQueriesCount() Get running queries count
long	getWaitingQueriesCount() Get waiting queries count
QueryPrepareHandle	prepare(LensSessionHandle sessionHandle, String query, LensConf conf, String queryName) Prepare the query.
boolean	updateQueryConf(LensSessionHandle sessionHandle, QueryHandle queryHandle, LensConf newconf) Update the query conf.
boolean	updateQueryConf(LensSessionHandle sessionHandle, QueryPrepareHandle prepareHandle, LensConf newconf) Update configuration for prepared query.

Methods inherited from interface org.apache.lens.server.api.health.HealthCheckable

getHealthStatus

Methods inherited from interface org.apache.lens.server.api.SessionValidator

validateSession

Field Detail

NAME

static final String NAME

The Constant NAME.

See Also:

Constant Field Values

Method Detail

estimate

QueryCost estimate(String requestId,
                 LensSessionHandle sessionHandle,
                 String query,
                 LensConf conf)
                   throws LensException

Estimate the cost of given query.

Parameters:

requestId - the request Id of request used to start estimate operation

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

conf - The query configuration

Returns:

The query cost

Throws:

LensException - thrown in case of failure

explain

QueryPlan explain(String requestId,
                LensSessionHandle sessionHandle,
                String query,
                LensConf conf)
                  throws LensException

Explain the given query.

Parameters:

requestId - the request Id of request used to start explain operation

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

conf - The query configuration

Returns:

The query plan;

Throws:

LensException - the lens exception

prepare

QueryPrepareHandle prepare(LensSessionHandle sessionHandle,
                         String query,
                         LensConf conf,
                         String queryName)
                           throws LensException

Prepare the query.

Parameters:

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

conf - The query configuration

queryName - the query name

Returns:

Prepare handle

Throws:

LensException - the lens exception

explainAndPrepare

QueryPlan explainAndPrepare(LensSessionHandle sessionHandle,
                          String query,
                          LensConf conf,
                          String queryName)
                            throws LensException

Explain the given query and prepare it as well.

Parameters:

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

conf - The query configuration

queryName - the query name

Returns:

The query plan; Query plan also consists of prepare handle, if it should be used to executePrepare

Throws:

LensException - the lens exception

executePrepareAsync

QueryHandle executePrepareAsync(LensSessionHandle sessionHandle,
                              QueryPrepareHandle prepareHandle,
                              LensConf conf,
                              String queryName)
                                throws LensException

Execute already prepared query asynchronously. Query can be prepared with explain

Parameters:

sessionHandle - the session handle

prepareHandle - The QueryPrepareHandle

conf - The configuration for the query to execute

queryName - the query name

Returns:

Returns the query handle

Throws:

LensException - the lens exception

executePrepare

QueryHandleWithResultSet executePrepare(LensSessionHandle sessionHandle,
                                      QueryPrepareHandle prepareHandle,
                                      long timeoutmillis,
                                      LensConf conf,
                                      String queryName)
                                        throws LensException

Execute already prepared query with timeout. Query can be prepared with explain

Parameters:

sessionHandle - the session handle

prepareHandle - The QueryPrepareHandle

timeoutmillis - The timeout after which it will return handle, if query did not finish before.

conf - The configuration for the query to execute

queryName - the query name

Returns:

the query handle with result set

Throws:

LensException - the lens exception

executeAsync

QueryHandle executeAsync(LensSessionHandle sessionHandle,
                       String query,
                       LensConf conf,
                       String queryName)
                         throws LensException

Asynchronously execute the query.

Parameters:

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

conf - The query configuration

queryName - the query name

Returns:

a query handle, which can used to know the status.

Throws:

LensException - the lens exception

updateQueryConf

boolean updateQueryConf(LensSessionHandle sessionHandle,
                      QueryHandle queryHandle,
                      LensConf newconf)
                        throws LensException

Update the query conf.

Parameters:

sessionHandle - the session handle

queryHandle - the query handle

newconf - the newconf

Returns:

true if update is successful

Throws:

LensException - the lens exception

execute

QueryHandleWithResultSet execute(LensSessionHandle sessionHandle,
                               String query,
                               long timeoutmillis,
                               LensConf conf,
                               String queryName)
                                 throws LensException

Execute the query with a timeout.

Parameters:

sessionHandle - the session handle

query - The query should be in HiveQL(SQL like)

timeoutmillis - The timeout after which it will return handle, if query did not finish before.

conf - The query configuration

queryName - the query name

Returns:

a query handle, if query did not finish within the timeout specified else result will also be returned.

Throws:

LensException - the lens exception

getQuery

LensQuery getQuery(LensSessionHandle sessionHandle,
                 QueryHandle queryHandle)
                   throws LensException

Get the query, specified by the handle.

Parameters:

sessionHandle - the session handle

queryHandle - The query handle

Returns:

query status

Throws:

LensException - the lens exception

getResultSetMetadata

QueryResultSetMetadata getResultSetMetadata(LensSessionHandle sessionHandle,
                                          QueryHandle queryHandle)
                                            throws LensException

Get the result set metadata - list of columns(names and types) and result size.

Parameters:

sessionHandle - the session handle

queryHandle - the query handle

Returns:

The result set metadata

Throws:

LensException - the lens exception

fetchResultSet

QueryResult fetchResultSet(LensSessionHandle sessionHandle,
                         QueryHandle queryHandle,
                         long startIndex,
                         int fetchSize)
                           throws LensException

Fetch the results of the query, specified by the handle.

Parameters:

sessionHandle - the session handle

queryHandle - The query handle

startIndex - The start Index from which result rows have to be fetched

fetchSize - Number of rows to be fetched

Returns:

returns the result set

Throws:

LensException - the lens exception

getHttpResultSet

javax.ws.rs.core.Response getHttpResultSet(LensSessionHandle sessionHandle,
                                         QueryHandle queryHandle)
                                           throws LensException

Get the http end point for the result set.

Parameters:

sessionHandle - The lens session handle

queryHandle - The query handle

Returns:

returns javax.ws.rs.core.Response object

Throws:

LensException - the lens exception

closeResultSet

void closeResultSet(LensSessionHandle sessionHandle,
                  QueryHandle queryHandle)
                    throws LensException

Closes result set by releasing any resources used in serving the resultset.

Parameters:

sessionHandle - the session handle

queryHandle - the query handle

Throws:

LensException - the lens exception

cancelQuery

boolean cancelQuery(LensSessionHandle sessionHandle,
                  QueryHandle queryHandle)
                    throws LensException

Cancel the execution of the query, specified by the handle.

Parameters:

sessionHandle - the session handle

queryHandle - The query handle.

Returns:

true if cancel was successful, false otherwise

Throws:

LensException - the lens exception

getAllQueries

List<QueryHandle> getAllQueries(LensSessionHandle sessionHandle,
                              String states,
                              String user,
                              String driver,
                              String queryName,
                              String fromDate,
                              String toDate)
                                throws LensException

Returns all the queries in the specified state, for the given user and matching query name.

Parameters:

sessionHandle - the session handle

states - return queries in these state. if null, all queries will be returned. Multiple states can be supplied separated by comma

user - Get queries submitted by a specific user. If this set to "all", queries of all users are returned

driver - Get queries submitted on a specific driver.

queryName - return queries containing the query name. If null, all queries will be returned

fromDate - start date of time range interval

toDate - end date of the time range interval

Returns:

List of query handles

Throws:

LensException - the lens exception

getAllPreparedQueries

List<QueryPrepareHandle> getAllPreparedQueries(LensSessionHandle sessionHandle,
                                             String user,
                                             String queryName,
                                             String fromDate,
                                             String toDate)
                                               throws LensException

Returns all the prepared queries for the specified user. If no user is passed, queries of all users will be returned.

Parameters:

sessionHandle - the session handle

user - returns queries of the user. If set to "all", returns queries of all users. By default returns the queries of the current user.

queryName - returns queries matching the query name

fromDate - start time for filtering prepared queries by preparation time

toDate - end time for filtering prepared queries by preparation time

Returns:

List of query prepare handles

Throws:

LensException - the lens exception

destroyPrepared

boolean destroyPrepared(LensSessionHandle sessionHandle,
                      QueryPrepareHandle prepared)
                        throws LensException

Destroy a prepared query.

Parameters:

sessionHandle - the session handle

prepared - the prepared

Returns:

return true if successful, false otherwise

Throws:

LensException - the lens exception

getPreparedQuery

LensPreparedQuery getPreparedQuery(LensSessionHandle sessionHandle,
                                 QueryPrepareHandle prepareHandle)
                                   throws LensException

Get prepared query.

Parameters:

sessionHandle - the session handle

prepareHandle - the prepare handle

Returns:

PreparedQueryContext object

Throws:

LensException - the lens exception

updateQueryConf

boolean updateQueryConf(LensSessionHandle sessionHandle,
                      QueryPrepareHandle prepareHandle,
                      LensConf newconf)
                        throws LensException

Update configuration for prepared query.

Parameters:

sessionHandle - the session handle

prepareHandle - the prepare handle

newconf - the newconf

Returns:

true if update is successful, false otherwise

Throws:

LensException - the lens exception

getQueuedQueriesCount

long getQueuedQueriesCount()

Get queued queries count

Returns:

queued queries count

getRunningQueriesCount

long getRunningQueriesCount()

Get running queries count

Returns:

running queries count

getWaitingQueriesCount

long getWaitingQueriesCount()

Get waiting queries count

Returns:

waiting queries count

getFinishedQueriesCount

long getFinishedQueriesCount()

Get finished queries count

Returns:

finished queries count

getLaunchingQueriesCount

long getLaunchingQueriesCount()

Get queries being launched count

Returns:

Queries being launched count