org.apache.tez.dag.app

Class ContainerContext

java.lang.Object

org.apache.tez.dag.app.ContainerContext

public class ContainerContext
extends Object

Constructor Summary

Constructors

Constructor and Description
ContainerContext(Map<String,org.apache.hadoop.yarn.api.records.LocalResource> localResources, org.apache.hadoop.security.Credentials credentials, Map<String,String> environment, String javaOpts)
ContainerContext(Map<String,org.apache.hadoop.yarn.api.records.LocalResource> localResources, org.apache.hadoop.security.Credentials credentials, Map<String,String> environment, String javaOpts, Vertex vertex)

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.security.Credentials	getCredentials()
Map<String,String>	getEnvironment()
String	getJavaOpts()
Map<String,org.apache.hadoop.yarn.api.records.LocalResource>	getLocalResources()
boolean	isExactMatch(ContainerContext otherContext)
boolean	isSuperSet(ContainerContext otherContext)
String	toString()
static ContainerContext	union(ContainerContext c1, ContainerContext c2) Create a new ContainerContext to account for container re-use.

Methods inherited from class java.lang.Object

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

Constructor Detail

ContainerContext

public ContainerContext(Map<String,org.apache.hadoop.yarn.api.records.LocalResource> localResources,
                        org.apache.hadoop.security.Credentials credentials,
                        Map<String,String> environment,
                        String javaOpts)

ContainerContext

public ContainerContext(Map<String,org.apache.hadoop.yarn.api.records.LocalResource> localResources,
                        org.apache.hadoop.security.Credentials credentials,
                        Map<String,String> environment,
                        String javaOpts,
                        @Nullable
                        Vertex vertex)

Method Detail

getLocalResources

public Map<String,org.apache.hadoop.yarn.api.records.LocalResource> getLocalResources()

getCredentials

public org.apache.hadoop.security.Credentials getCredentials()

getEnvironment

public Map<String,String> getEnvironment()

getJavaOpts

public String getJavaOpts()

isSuperSet

public boolean isSuperSet(ContainerContext otherContext)

Returns:

true if this ContainerContext is a super-set of the specified container context.

isExactMatch

public boolean isExactMatch(ContainerContext otherContext)

Returns:

true if this ContainerContext is an exact match of the specified container context.

union

public static ContainerContext union(ContainerContext c1,
                                     ContainerContext c2)

Create a new ContainerContext to account for container re-use. On re-use, there is re-localization of additional LocalResources. Also, a task from a different vertex could be run on the given container. Only a merge of local resources is needed as: credentials are modified at run-time based on the task spec. the environment for a container cannot be changed. A re-used container is always expected to have a super-set. javaOpts have to be identical for re-use. Vertex should be overridden to account for the new task being scheduled to run on this container context.

Parameters:

c1 - ContainerContext 1 Original task's context

c2 - ContainerContext 2 Newly assigned task's context

Returns:

Merged ContainerContext

toString

public String toString()

Overrides:

toString in class Object