org.apache.hadoop.net

クラス ScriptBasedMapping

java.lang.Object

org.apache.hadoop.net.AbstractDNSToSwitchMapping

org.apache.hadoop.net.CachedDNSToSwitchMapping

org.apache.hadoop.net.ScriptBasedMapping

すべての実装されたインタフェース:

Configurable, DNSToSwitchMapping

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public class ScriptBasedMapping
extends CachedDNSToSwitchMapping

This class implements the DNSToSwitchMapping interface using a script configured via the CommonConfigurationKeysPublic.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY option.

It contains a static class RawScriptBasedMapping that performs the work: reading the configuration parameters, executing any defined script, handling errors and such like. The outer class extends CachedDNSToSwitchMapping to cache the delegated queries.

This DNS mapper's CachedDNSToSwitchMapping.isSingleSwitch() predicate returns true if and only if a script is defined.

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
static String	NO_SCRIPT Text used in the toString() method if there is no string "no script"

クラスから継承されたフィールド org.apache.hadoop.net.CachedDNSToSwitchMapping

rawMapping

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
ScriptBasedMapping() Create an instance with the default configuration.
ScriptBasedMapping(Configuration conf) Create an instance from the given configuration
ScriptBasedMapping(DNSToSwitchMapping rawMap) Create an instance from the given raw mapping

メソッドのサマリー

修飾子とタイプ	メソッドと説明
Configuration	getConf() Return the configuration used by this object.
void	setConf(Configuration conf) Set the configuration to be used by this object.
String	toString()

クラスから継承されたメソッド org.apache.hadoop.net.CachedDNSToSwitchMapping

getSwitchMap, isSingleSwitch, reloadCachedMappings, reloadCachedMappings, resolve

クラスから継承されたメソッド org.apache.hadoop.net.AbstractDNSToSwitchMapping

dumpTopology, isMappingSingleSwitch, isSingleSwitchByScriptPolicy

クラスから継承されたメソッド java.lang.Object

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

フィールドの詳細

NO_SCRIPT

public static final String NO_SCRIPT

Text used in the toString() method if there is no string "no script"

関連項目:

定数フィールド値

コンストラクタの詳細

ScriptBasedMapping

public ScriptBasedMapping()

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.

ScriptBasedMapping

public ScriptBasedMapping(DNSToSwitchMapping rawMap)

Create an instance from the given raw mapping

パラメータ:

rawMap - raw DNSTOSwithMapping

ScriptBasedMapping

public ScriptBasedMapping(Configuration conf)

Create an instance from the given configuration

パラメータ:

conf - configuration

メソッドの詳細

getConf

public Configuration getConf()

インタフェースからコピーされた説明: Configurable

Return the configuration used by this object.

定義:

getConf インタフェース内 Configurable

オーバーライド:

getConf クラス内 AbstractDNSToSwitchMapping

toString

public String toString()

オーバーライド:

toString クラス内 CachedDNSToSwitchMapping

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.

定義:

setConf インタフェース内 Configurable

オーバーライド:

setConf クラス内 AbstractDNSToSwitchMapping

パラメータ:

conf -