org.apache.pig.backend.executionengine

Interface ExecJob

All Known Implementing Classes:

HJob

public interface ExecJob

Abstraction on a job that the execution engine runs. It allows the front-end to retrieve information on job status and manage a running job.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ExecJob.JOB_STATUS

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROGRESS_KEY

Method Summary

Methods

Modifier and Type	Method and Description
void	completionNotification(Object cookie) hook for asynchronous notification of job completion pushed from the back-end
String	getAlias() Returns the alias of relation generated by this job
Properties	getConfiguration() Get configuration information
Exception	getException() Get exceptions that happened during execution
void	getLogs(OutputStream log) Collecting various forms of outputs
POStore	getPOStore()
Iterator<Tuple>	getResults() if query has executed successfully we want to retrieve the results via iterating over them.
PigStats	getStatistics() Can be information about the state (not submitted, e.g.
ExecJob.JOB_STATUS	getStatus()
void	getSTDError(OutputStream error)
void	getSTDOut(OutputStream out)
boolean	hasCompleted() true is the physical plan has executed successfully and results are ready to be retrieved
void	kill() Kills current job.

Field Detail

PROGRESS_KEY

static final String PROGRESS_KEY

See Also:

Constant Field Values

Method Detail

getStatus

ExecJob.JOB_STATUS getStatus()

hasCompleted

boolean hasCompleted()
                     throws ExecException

true is the physical plan has executed successfully and results are ready to be retrieved

Returns:

true if execution has completed, false otherwise.

Throws:

ExecException

getResults

Iterator<Tuple> getResults()
                           throws ExecException

if query has executed successfully we want to retrieve the results via iterating over them.

Returns:

iterator for resulting tuples

Throws:

ExecException

getAlias

String getAlias()
                throws ExecException

Returns the alias of relation generated by this job

Throws:

ExecException

getConfiguration

Properties getConfiguration()

Get configuration information

Returns:

configuration information for the execution engine

getStatistics

PigStats getStatistics()

Can be information about the state (not submitted, e.g. the execute method has not been called yet; not running, e.g. execute has been issued, but job is waiting; running...; completed; aborted...; progress information

Returns:

statistics relevant to the execution engine

getPOStore

POStore getPOStore()

Returns:

POStore object associated with the store

completionNotification

void completionNotification(Object cookie)

hook for asynchronous notification of job completion pushed from the back-end

kill

void kill()
          throws ExecException

Kills current job.

Throws:

ExecException

getLogs

void getLogs(OutputStream log)
             throws ExecException

Collecting various forms of outputs

Throws:

ExecException

getSTDOut

void getSTDOut(OutputStream out)
               throws ExecException

Throws:

ExecException

getSTDError

void getSTDError(OutputStream error)
                 throws ExecException

Throws:

ExecException

getException

Exception getException()

Get exceptions that happened during execution