Package org.apache.hadoop.net

Class ScriptBasedMappingWithDependency

java.lang.Object

org.apache.hadoop.net.AbstractDNSToSwitchMapping

org.apache.hadoop.net.CachedDNSToSwitchMapping

org.apache.hadoop.net.ScriptBasedMapping

org.apache.hadoop.net.ScriptBasedMappingWithDependency

All Implemented Interfaces:

Configurable, DNSToSwitchMapping, DNSToSwitchMappingWithDependency

@Private
@Evolving
public class ScriptBasedMappingWithDependency
extends ScriptBasedMapping
implements DNSToSwitchMappingWithDependency

This class extends ScriptBasedMapping class and implements the DNSToSwitchMappingWithDependency interface using a script configured via the CommonConfigurationKeysPublic.NET_DEPENDENCY_SCRIPT_FILE_NAME_KEY option.

It contains a static class RawScriptBasedMappingWithDependency that performs the getDependency work.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.net.ScriptBasedMapping

ScriptBasedMapping.RawScriptBasedMapping

Field Summary

Fields inherited from class org.apache.hadoop.net.ScriptBasedMapping

NO_SCRIPT

Fields inherited from class org.apache.hadoop.net.CachedDNSToSwitchMapping

rawMapping

Constructor Summary

Constructors

Constructor	Description
ScriptBasedMappingWithDependency()	Create an instance with the default configuration.

Method Summary

Modifier and Type	Method	Description
List<String>	getDependency(String name)	Get dependencies in the topology for a given host
void	setConf(Configuration conf)	Set the configuration to be used by this object.
String	toString()

Methods inherited from class org.apache.hadoop.net.ScriptBasedMapping

getConf

Methods inherited from class org.apache.hadoop.net.CachedDNSToSwitchMapping

getSwitchMap, isSingleSwitch, reloadCachedMappings, reloadCachedMappings, resolve

Methods inherited from class org.apache.hadoop.net.AbstractDNSToSwitchMapping

dumpTopology, isMappingSingleSwitch, isSingleSwitchByScriptPolicy

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.net.DNSToSwitchMapping

reloadCachedMappings, reloadCachedMappings, resolve

Constructor Details

ScriptBasedMappingWithDependency

public ScriptBasedMappingWithDependency()

Create an instance with the default configuration.

Calling setConf(Configuration) will trigger a re-evaluation of the configuration settings and so be used to set up the mapping script.

Method Details

toString

public String toString()

Overrides:

toString in class ScriptBasedMapping

setConf

public void setConf(Configuration conf)

Set the configuration to be used by this object..

This will get called in the superclass constructor, so a check is needed to ensure that the raw mapping is defined before trying to relaying a null configuration.

.

This will get called in the superclass constructor, so a check is needed to ensure that the raw mapping is defined before trying to relaying a null configuration.

Specified by:

setConf in interface Configurable

Overrides:

setConf in class ScriptBasedMapping

Parameters:

conf - input Configuration.

getDependency

public List<String> getDependency(String name)

Get dependencies in the topology for a given host

Specified by:

getDependency in interface DNSToSwitchMappingWithDependency

Parameters:

name - - host name for which we are getting dependency

Returns:

a list of hosts dependent on the provided host name