org.apache.storm.container.cgroup

Class CgroupManager

java.lang.Object

org.apache.storm.container.cgroup.CgroupManager

All Implemented Interfaces:

ResourceIsolationInterface

public class CgroupManager
extends Object
implements ResourceIsolationInterface

Class that implements ResourceIsolationInterface that manages cgroups.

Constructor Summary

Constructors

Constructor and Description
CgroupManager()

Method Summary

Modifier and Type	Method and Description
List<String>	getLaunchCommand(String workerId, List<String> existingCommand) After reserving resources for the worker (i.e.
List<String>	getLaunchCommandPrefix(String workerId) After reserving resources for the worker (i.e.
long	getMemoryUsage(String workerId) Get the current memory usage of the a given worker.
Set<Long>	getRunningPids(String workerId) Get the list of PIDs currently in an isolated container.
long	getSystemFreeMemoryMb()
void	prepare(Map<String,Object> conf) initialize data structures.
void	releaseResourcesForWorker(String workerId) This function will be called when the worker needs to shutdown.
void	reserveResourcesForWorker(String workerId, Integer totalMem, Integer cpuNum) This function should be used prior to starting the worker to reserve resources for the worker.

Methods inherited from class java.lang.Object

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

Constructor Detail

CgroupManager

public CgroupManager()

Method Detail

prepare

public void prepare(Map<String,Object> conf)
             throws IOException

initialize data structures.

Specified by:

prepare in interface ResourceIsolationInterface

Parameters:

conf - storm confs

Throws:

IOException - on any error.

reserveResourcesForWorker

public void reserveResourcesForWorker(String workerId,
                                      Integer totalMem,
                                      Integer cpuNum)
                               throws SecurityException

Description copied from interface: ResourceIsolationInterface

This function should be used prior to starting the worker to reserve resources for the worker.

Specified by:

reserveResourcesForWorker in interface ResourceIsolationInterface

Parameters:

workerId - worker id of the worker to start

totalMem - the amount of memory for the worker or null if not enforced

cpuNum - the amount of cpu for the worker or null if not enforced

Throws:

SecurityException

releaseResourcesForWorker

public void releaseResourcesForWorker(String workerId)

Description copied from interface: ResourceIsolationInterface

This function will be called when the worker needs to shutdown. This function should include logic to clean up after a worker is shutdown.

Specified by:

releaseResourcesForWorker in interface ResourceIsolationInterface

Parameters:

workerId - worker id to shutdown and clean up after

getLaunchCommand

public List<String> getLaunchCommand(String workerId,
                                     List<String> existingCommand)

Description copied from interface: ResourceIsolationInterface

After reserving resources for the worker (i.e. calling reserveResourcesForWorker). This function can be used to get the modified command line to launch the worker with resource isolation

Specified by:

getLaunchCommand in interface ResourceIsolationInterface

existingCommand - the current command to run that may need to be modified.

Returns:

new commandline with necessary additions to launch worker with resource isolation

getLaunchCommandPrefix

public List<String> getLaunchCommandPrefix(String workerId)

Description copied from interface: ResourceIsolationInterface

After reserving resources for the worker (i.e. calling reserveResourcesForWorker). this function can be used to get the launch command prefix

Specified by:

getLaunchCommandPrefix in interface ResourceIsolationInterface

Parameters:

workerId - the of the worker

Returns:

the command line prefix for launching a worker with resource isolation

getRunningPids

public Set<Long> getRunningPids(String workerId)
                         throws IOException

Description copied from interface: ResourceIsolationInterface

Get the list of PIDs currently in an isolated container.

Specified by:

getRunningPids in interface ResourceIsolationInterface

Parameters:

workerId - the id of the worker to get these for

Returns:

the set of PIDs, this will be combined with other ways of getting PIDs. An Empty set if no PIDs are found.

Throws:

IOException - on any error

getMemoryUsage

public long getMemoryUsage(String workerId)
                    throws IOException

Description copied from interface: ResourceIsolationInterface

Get the current memory usage of the a given worker.

Specified by:

getMemoryUsage in interface ResourceIsolationInterface

Parameters:

workerId - the id of the worker

Returns:

the amount of memory the worker is using in bytes or -1 if not supported

Throws:

IOException - on any error.

getSystemFreeMemoryMb

public long getSystemFreeMemoryMb()
                           throws IOException

Specified by:

getSystemFreeMemoryMb in interface ResourceIsolationInterface

Returns:

The amount of memory in bytes that are free on the system. This might not be the entire box, it might be within a parent resource group.

Throws:

IOException - on any error.