Package org.apache.hadoop.hdfs.server.federation.router

Class FederationUtil

java.lang.Object

org.apache.hadoop.hdfs.server.federation.router.FederationUtil

public final class FederationUtil
extends java.lang.Object

Utilities for managing HDFS federation.

Method Summary

Modifier and Type	Method	Description
static java.util.Set<java.lang.String>	getAllConfiguredNS(org.apache.hadoop.conf.Configuration conf)	Collect all configured nameservices.
static java.lang.String	getCompileInfo()	Fetch the build/compile information for this jar.
static org.codehaus.jettison.json.JSONArray	getJmx(java.lang.String beanQuery, java.lang.String webAddress, org.apache.hadoop.hdfs.web.URLConnectionFactory connectionFactory, java.lang.String scheme)	Get a JMX data from a web endpoint.
static java.lang.String	getVersion()	Fetch the Hadoop version string for this jar.
static ActiveNamenodeResolver	newActiveNamenodeResolver(org.apache.hadoop.conf.Configuration conf, StateStoreService stateStore)	Creates an instance of an ActiveNamenodeResolver from the configuration.
static RouterRpcFairnessPolicyController	newFairnessPolicyController(org.apache.hadoop.conf.Configuration conf)	Creates an instance of an RouterRpcFairnessPolicyController from the configuration.
static FileSubclusterResolver	newFileSubclusterResolver(org.apache.hadoop.conf.Configuration conf, Router router)	Creates an instance of a FileSubclusterResolver from the configuration.
static org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager<org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier>	newSecretManager(org.apache.hadoop.conf.Configuration conf)	Creates an instance of DelegationTokenSecretManager from the configuration.
static org.apache.hadoop.hdfs.protocol.HdfsFileStatus	updateMountPointStatus(org.apache.hadoop.hdfs.protocol.HdfsFileStatus dirStatus, int children)	Add the number of children for an existing HdfsFileStatus object.

Methods inherited from class java.lang.Object

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

Method Detail

getJmx

public static org.codehaus.jettison.json.JSONArray getJmx(java.lang.String beanQuery,
                                                          java.lang.String webAddress,
                                                          org.apache.hadoop.hdfs.web.URLConnectionFactory connectionFactory,
                                                          java.lang.String scheme)

Get a JMX data from a web endpoint.

Parameters:

beanQuery - JMX bean.

webAddress - Web address of the JMX endpoint.

connectionFactory - to open http/https connection.

scheme - to use for URL connection.

Returns:

JSON with the JMX data

getVersion

public static java.lang.String getVersion()

Fetch the Hadoop version string for this jar.

Returns:

Hadoop version string, e.g., 3.0.1.

getCompileInfo

public static java.lang.String getCompileInfo()

Fetch the build/compile information for this jar.

Returns:

String Compilation info.

newFileSubclusterResolver

public static FileSubclusterResolver newFileSubclusterResolver(org.apache.hadoop.conf.Configuration conf,
                                                               Router router)

Creates an instance of a FileSubclusterResolver from the configuration.

Parameters:

conf - Configuration that defines the file resolver class.

router - Router service.

Returns:

New file subcluster resolver.

newActiveNamenodeResolver

public static ActiveNamenodeResolver newActiveNamenodeResolver(org.apache.hadoop.conf.Configuration conf,
                                                               StateStoreService stateStore)

Creates an instance of an ActiveNamenodeResolver from the configuration.

Parameters:

conf - Configuration that defines the namenode resolver class.

stateStore - State store passed to class constructor.

Returns:

New active namenode resolver.

newSecretManager

public static org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager<org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier> newSecretManager(org.apache.hadoop.conf.Configuration conf)

Creates an instance of DelegationTokenSecretManager from the configuration.

Parameters:

conf - Configuration that defines the token manager class.

Returns:

New delegation token secret manager.

updateMountPointStatus

public static org.apache.hadoop.hdfs.protocol.HdfsFileStatus updateMountPointStatus(org.apache.hadoop.hdfs.protocol.HdfsFileStatus dirStatus,
                                                                                    int children)

Add the number of children for an existing HdfsFileStatus object.

Parameters:

dirStatus - HdfsfileStatus object.

children - number of children to be added.

Returns:

HdfsFileStatus with the number of children specified.

newFairnessPolicyController

public static RouterRpcFairnessPolicyController newFairnessPolicyController(org.apache.hadoop.conf.Configuration conf)

Creates an instance of an RouterRpcFairnessPolicyController from the configuration.

Parameters:

conf - Configuration that defines the fairness controller class.

Returns:

Fairness policy controller.

getAllConfiguredNS

public static java.util.Set<java.lang.String> getAllConfiguredNS(org.apache.hadoop.conf.Configuration conf)
                                                          throws java.lang.IllegalArgumentException

Collect all configured nameservices.

Parameters:

conf - the configuration object.

Returns:

Set of name services in config.

Throws:

java.lang.IllegalArgumentException - if monitored namenodes are not correctly configured.