org.apache.drill.exec.work.fragment

Class FragmentExecutor

java.lang.Object

org.apache.drill.exec.work.fragment.FragmentExecutor

All Implemented Interfaces:

Runnable

public class FragmentExecutor
extends Object
implements Runnable

Responsible for running a single fragment on a single Drillbit. Listens/responds to status request and cancellation messages.

Constructor Summary

Constructors

Constructor and Description
FragmentExecutor(FragmentContext context, BitControl.PlanFragment fragment, FragmentStatusReporter statusReporter) Create a FragmentExecutor where we need to parse and materialize the root operator.
FragmentExecutor(FragmentContext context, BitControl.PlanFragment fragment, FragmentStatusReporter statusReporter, FragmentRoot rootOperator) Create a FragmentExecutor where we already have a root operator in memory.

Method Summary

Methods

Modifier and Type	Method and Description
void	cancel() Cancel the execution of this fragment is in an appropriate state.
FragmentContext	getContext()
BitControl.FragmentStatus	getStatus() Returns the current fragment status if the fragment is running.
void	receivingFragmentFinished(ExecProtos.FragmentHandle handle) Inform this fragment that one of its downstream partners no longer needs additional records.
void	run()
String	toString()
void	unpause() Resume all the pauses within the current context.

Methods inherited from class java.lang.Object

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

Constructor Detail

FragmentExecutor

public FragmentExecutor(FragmentContext context,
                BitControl.PlanFragment fragment,
                FragmentStatusReporter statusReporter)

Create a FragmentExecutor where we need to parse and materialize the root operator.

Parameters:

context -

fragment -

statusReporter -

FragmentExecutor

public FragmentExecutor(FragmentContext context,
                BitControl.PlanFragment fragment,
                FragmentStatusReporter statusReporter,
                FragmentRoot rootOperator)

Create a FragmentExecutor where we already have a root operator in memory.

Parameters:

context -

fragment -

statusReporter -

rootOperator -

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getStatus

public BitControl.FragmentStatus getStatus()

Returns the current fragment status if the fragment is running. Otherwise, returns no status.

Returns:

FragmentStatus or null.

cancel

public void cancel()

Cancel the execution of this fragment is in an appropriate state. Messages come from external. NOTE that this will be called from threads *other* than the one running this runnable(), so we need to be careful about the state transitions that can result.

unpause

public void unpause()

Resume all the pauses within the current context. Note that this method will be called from threads *other* than the one running this runnable(). Also, this method can be called multiple times.

receivingFragmentFinished

public void receivingFragmentFinished(ExecProtos.FragmentHandle handle)

Inform this fragment that one of its downstream partners no longer needs additional records. This is most commonly called in the case that a limit query is executed.

Parameters:

handle - The downstream FragmentHandle of the Fragment that needs no more records from this Fragment.

run

public void run()

Specified by:

run in interface Runnable

getContext

public FragmentContext getContext()