Package org.apache.drill.exec.work.foreman.rm

Class ThrottledResourceManager.QueuedQueryResourceManager

java.lang.Object

org.apache.drill.exec.work.foreman.rm.ThrottledResourceManager.QueuedResourceAllocator

org.apache.drill.exec.work.foreman.rm.ThrottledResourceManager.QueuedQueryResourceManager

All Implemented Interfaces:

QueryResourceAllocator, QueryResourceManager

Enclosing class:

ThrottledResourceManager

public static class ThrottledResourceManager.QueuedQueryResourceManager
extends ThrottledResourceManager.QueuedResourceAllocator
implements QueryResourceManager

Per-query resource manager. Handles resources and optional queue lease for a single query. As such, this is a non-shared resource: it is associated with a Foreman: a single thread at plan time, and a single event (in some thread) at query completion time. Because of these semantics, no synchronization is needed within this class.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.work.foreman.rm.ThrottledResourceManager.QueuedResourceAllocator

ThrottledResourceManager.QueuedResourceAllocator.BufferedOpFinder

Field Summary

Fields inherited from class org.apache.drill.exec.work.foreman.rm.ThrottledResourceManager.QueuedResourceAllocator

plan, queryContext, queryCost, rm, work

Constructor Summary

Constructors

Constructor	Description
QueuedQueryResourceManager(ThrottledResourceManager rm, Foreman foreman)

Method Summary

Modifier and Type	Method	Description
void	admit()	Admit the query into the cluster.
void	exit()	Mark the query as completing, giving up its slot in the cluster.
QueryParallelizer	getParallelizer(boolean planHasMemory)	Create a parallelizer to parallelize each major fragment of the query into many minor fragments.
boolean	hasQueue()	Hint that this resource manager queues.
protected long	queryMemoryPerNode()
String	queueName()	Returns the name of the queue (if any) on which the query was placed.
void	setCost(double cost)	For some cases the foreman does not have a full plan, just a cost.

Methods inherited from class org.apache.drill.exec.work.foreman.rm.ThrottledResourceManager.QueuedResourceAllocator

getQueryContext, visitAbstractPlan, visitPhysicalPlan

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.exec.work.foreman.rm.QueryResourceAllocator

visitAbstractPlan, visitPhysicalPlan

Constructor Details

QueuedQueryResourceManager

public QueuedQueryResourceManager(ThrottledResourceManager rm,
 Foreman foreman)

Method Details

setCost

public void setCost(double cost)

Description copied from interface: QueryResourceManager

For some cases the foreman does not have a full plan, just a cost. In this case, this object will not plan memory, but still needs the cost to place the job into the correct queue.

Specified by:

setCost in interface QueryResourceManager

getParallelizer

public QueryParallelizer getParallelizer(boolean planHasMemory)

Description copied from interface: QueryResourceManager

Create a parallelizer to parallelize each major fragment of the query into many minor fragments. The parallelizer encapsulates the logic of how much memory and parallelism is required for the query.

Specified by:

getParallelizer in interface QueryResourceManager

Parameters:

planHasMemory - memory planning needs to be done during parallelization

Returns:

admit

public void admit()
           throws QueryQueue.QueueTimeoutException,
QueryQueue.QueryQueueException

Description copied from interface: QueryResourceManager

Admit the query into the cluster. Blocks until the query can run. (Later revisions may use a more thread-friendly approach.)

Specified by:

admit in interface QueryResourceManager

Throws:

QueryQueue.QueueTimeoutException - if the query timed out waiting to be admitted.

QueryQueue.QueryQueueException - if something goes wrong with the queue mechanism

queryMemoryPerNode

protected long queryMemoryPerNode()

Overrides:

queryMemoryPerNode in class ThrottledResourceManager.QueuedResourceAllocator

exit

public void exit()

Description copied from interface: QueryResourceManager

Mark the query as completing, giving up its slot in the cluster. Releases any lease that may be held for a system with queues.

Specified by:

exit in interface QueryResourceManager

hasQueue

public boolean hasQueue()

Description copied from interface: QueryResourceManager

Hint that this resource manager queues. Allows the Foreman to short-circuit expensive logic if no queuing will actually be done. This is a static attribute per Drillbit run.

Specified by:

hasQueue in interface QueryResourceManager

queueName

public String queueName()

Description copied from interface: QueryResourceManager

Returns the name of the queue (if any) on which the query was placed. Valid only after the query is admitted.

Specified by:

queueName in interface QueryResourceManager

Returns:

queue name, or null if queuing is not enabled.