Package org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources

Class CGroupsMemoryResourceHandlerImpl

java.lang.Object

org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.AbstractCGroupsMemoryResourceHandler

org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.CGroupsMemoryResourceHandlerImpl

All Implemented Interfaces:

MemoryResourceHandler, ResourceHandler

@Private
@Unstable
public class CGroupsMemoryResourceHandlerImpl
extends AbstractCGroupsMemoryResourceHandler

Handler class to handle the memory controller. YARN already ships a physical memory monitor in Java but it isn't as good as CGroups. This handler sets the soft and hard memory limits. The soft limit is set to 90% of the hard limit.

Field Summary

Fields inherited from class org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.AbstractCGroupsMemoryResourceHandler

MEMORY, OPPORTUNISTIC_SOFT_LIMIT

Method Summary

Modifier and Type	Method	Description
List<PrivilegedOperation>	bootstrap(org.apache.hadoop.conf.Configuration conf)	Bootstrap resource susbsystem.
protected void	updateGuaranteedMemoryLimits(String cgroupId, long containerSoftLimit)
protected void	updateMemoryHardLimit(String cgroupId, long containerHardLimit)
protected void	updateOpportunisticMemoryLimits(String cgroupId)

Methods inherited from class org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.AbstractCGroupsMemoryResourceHandler

getCGroupsHandler, postComplete, preStart, reacquireContainer, teardown, toString, updateContainer

Methods inherited from class java.lang.Object

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

Method Details

bootstrap

public List<PrivilegedOperation> bootstrap(org.apache.hadoop.conf.Configuration conf)
                                    throws ResourceHandlerException

Description copied from interface: ResourceHandler

Bootstrap resource susbsystem.

Specified by:

bootstrap in interface ResourceHandler

Overrides:

bootstrap in class AbstractCGroupsMemoryResourceHandler

Returns:

(possibly empty) list of operations that require elevated privileges

Throws:

ResourceHandlerException

updateMemoryHardLimit

protected void updateMemoryHardLimit(String cgroupId,
 long containerHardLimit)
                              throws ResourceHandlerException

Specified by:

updateMemoryHardLimit in class AbstractCGroupsMemoryResourceHandler

Throws:

ResourceHandlerException

updateOpportunisticMemoryLimits

protected void updateOpportunisticMemoryLimits(String cgroupId)
                                        throws ResourceHandlerException

Specified by:

updateOpportunisticMemoryLimits in class AbstractCGroupsMemoryResourceHandler

Throws:

ResourceHandlerException

updateGuaranteedMemoryLimits

protected void updateGuaranteedMemoryLimits(String cgroupId,
 long containerSoftLimit)
                                     throws ResourceHandlerException

Specified by:

updateGuaranteedMemoryLimits in class AbstractCGroupsMemoryResourceHandler

Throws:

ResourceHandlerException