RackManager (Apache HBase 1.2.12 API)

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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.apache.commons.logging.Log`	`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

Methods
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.apache.commons.logging.Log 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

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