org.apache.hadoop.hbase.master

Class RackManager

java.lang.Object

org.apache.hadoop.hbase.master.RackManager

Direct Known Subclasses:

BaseLoadBalancer.DefaultRackManager

@InterfaceAudience.Private
public class RackManager
extends Object

Wrapper over the rack resolution utility in Hadoop. The rack resolution utility in Hadoop does resolution from hosts to the racks they belong to.

Field Summary

Fields

Modifier and Type	Field and Description
private static org.slf4j.Logger	LOG
private org.apache.hadoop.net.DNSToSwitchMapping	switchMapping
static String	UNKNOWN_RACK

Constructor Summary

Constructors

Constructor and Description
RackManager()
RackManager(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
List<String>	getRack(List<ServerName> servers) Same as getRack(ServerName) except that a list is passed
String	getRack(ServerName server) Get the name of the rack containing a server, according to the DNS to switch mapping.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

UNKNOWN_RACK

public static final String UNKNOWN_RACK

See Also:

Constant Field Values

switchMapping

private org.apache.hadoop.net.DNSToSwitchMapping switchMapping

Constructor Detail

RackManager

public RackManager()

RackManager

public RackManager(org.apache.hadoop.conf.Configuration conf)

Method Detail

getRack

public String getRack(ServerName server)

Get the name of the rack containing a server, according to the DNS to switch mapping.

Parameters:

server - the server for which to get the rack name

Returns:

the rack name of the server

getRack

public List<String> getRack(List<ServerName> servers)

Same as getRack(ServerName) except that a list is passed

Parameters:

servers - list of servers we're requesting racks information for

Returns:

list of racks for the given list of servers