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java.lang.Objectorg.apache.hadoop.yarn.api.records.Container
@InterfaceAudience.Public @InterfaceStability.Stable public abstract class Container
Container represents an allocated resource in the cluster.
The ResourceManager is the sole authority to allocate any
Container to applications. The allocated Container
is always on a single node and has a unique ContainerId. It has
a specific amount of Resource allocated.
It includes details such as:
ContainerId for the container, which is globally unique.NodeId of the node on which it is allocated.
Resource allocated to the container.Priority at which the container was allocated.Token of the container, used to securely verify
authenticity of the allocation.
Typically, an ApplicationMaster receives the
Container from the ResourceManager during
resource-negotiation and then talks to the NodeManager to
start/stop containers.
ApplicationMasterProtocol.allocate(org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest),
ContainerManagementProtocol.startContainers(org.apache.hadoop.yarn.api.protocolrecords.StartContainersRequest),
ContainerManagementProtocol.stopContainers(org.apache.hadoop.yarn.api.protocolrecords.StopContainersRequest)| Constructor Summary | |
|---|---|
Container()
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| Method Summary | |
|---|---|
abstract Token |
getContainerToken()
Get the ContainerToken for the container. |
abstract ContainerId |
getId()
Get the globally unique identifier for the container. |
abstract String |
getNodeHttpAddress()
Get the http uri of the node on which the container is allocated. |
abstract NodeId |
getNodeId()
Get the identifier of the node on which the container is allocated. |
abstract Priority |
getPriority()
Get the Priority at which the Container was
allocated. |
abstract Resource |
getResource()
Get the Resource allocated to the container. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Methods inherited from interface java.lang.Comparable |
|---|
compareTo |
| Constructor Detail |
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public Container()
| Method Detail |
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@InterfaceAudience.Public @InterfaceStability.Stable public abstract ContainerId getId()
@InterfaceAudience.Public @InterfaceStability.Stable public abstract NodeId getNodeId()
@InterfaceAudience.Public @InterfaceStability.Stable public abstract String getNodeHttpAddress()
@InterfaceAudience.Public @InterfaceStability.Stable public abstract Resource getResource()
Resource allocated to the container.
Resource allocated to the container@InterfaceAudience.Public @InterfaceStability.Stable public abstract Priority getPriority()
Priority at which the Container was
allocated.
Priority at which the Container was
allocated@InterfaceAudience.Public @InterfaceStability.Stable public abstract Token getContainerToken()
ContainerToken for the container.
ContainerToken is the security token used by the framework
to verify authenticity of any Container.
The ResourceManager, on container allocation provides a
secure token which is verified by the NodeManager on
container launch.
Applications do not need to care about ContainerToken, they
are transparently handled by the framework - the allocated
Container includes the ContainerToken.
ContainerToken for the containerApplicationMasterProtocol.allocate(org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest),
ContainerManagementProtocol.startContainers(org.apache.hadoop.yarn.api.protocolrecords.StartContainersRequest)
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