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

Interface ResourceManager

All Known Implementing Classes:

AbstractResourceManager, DefaultResourceManager, DistributedResourceManager, DynamicResourceManager, ThrottledResourceManager

public interface ResourceManager

Drillbit-wide resource manager shared by all queries. Manages memory (at present) and CPU (planned). Since queries are the primary consumer of resources, manages resources by throttling queries into the system, and allocating resources to queries in order to control total use. An "null" implementation handles the case of no queuing. Clearly, the null case cannot effectively control resource use.

Method Summary

Modifier and Type	Method and Description
void	close()
int	cpusPerNode()
long	memoryPerNode() Returns the memory, in bytes, assigned to each node in a Drill cluster.
QueryResourceManager	newQueryRM(Foreman foreman) Create a resource manager to execute a query.
QueryResourceAllocator	newResourceAllocator(QueryContext queryContext) Create a resource manager to prepare or describe a query.

Method Detail

memoryPerNode

long memoryPerNode()

Returns the memory, in bytes, assigned to each node in a Drill cluster. Drill requires that nodes are symmetrical. So, knowing the memory on any one node also gives the memory on all other nodes.

Returns:

the memory, in bytes, available in each Drillbit

cpusPerNode

int cpusPerNode()

newResourceAllocator

QueryResourceAllocator newResourceAllocator(QueryContext queryContext)

Create a resource manager to prepare or describe a query. In this form, no queuing is done, but the plan is created as if queuing had been done. Used when executing EXPLAIN PLAN.

Returns:

a resource manager for the query

newQueryRM

QueryResourceManager newQueryRM(Foreman foreman)

Create a resource manager to execute a query.

Parameters:

foreman - Foreman which manages the execution

Returns:

a resource manager for the query

close

void close()