org.apache.hadoop.hbase.util

类 ConnectionCache

java.lang.Object

org.apache.hadoop.hbase.util.ConnectionCache

@InterfaceAudience.Private
public class ConnectionCache
extends Object

A utility to store user specific HConnections in memory. There is a chore to clean up connections idle for too long. This class is used by REST server and Thrift server to support authentication and impersonation.

构造器概要

构造器

构造器和说明
ConnectionCache(org.apache.hadoop.conf.Configuration conf, UserProvider userProvider, int cleanInterval, int maxIdleTime)

方法概要

限定符和类型	方法和说明
Admin	getAdmin() Caller doesn't close the admin afterwards.
String	getEffectiveUser() Get the current thread local effective user
RegionLocator	getRegionLocator(byte[] tableName) Retrieve a regionLocator for the table.
Table	getTable(String tableName) Caller closes the table afterwards.
void	setEffectiveUser(String user) Set the current thread local effective user
void	shutdown() Called when cache is no longer needed so that it can perform cleanup operations
boolean	updateConnectionAccessTime() Updates the access time for the current connection.

从类继承的方法 java.lang.Object

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

构造器详细资料

ConnectionCache

public ConnectionCache(org.apache.hadoop.conf.Configuration conf,
                       UserProvider userProvider,
                       int cleanInterval,
                       int maxIdleTime)
                throws IOException

抛出:

IOException

方法详细资料

setEffectiveUser

public void setEffectiveUser(String user)

Set the current thread local effective user

getEffectiveUser

public String getEffectiveUser()

Get the current thread local effective user

shutdown

public void shutdown()

Called when cache is no longer needed so that it can perform cleanup operations

getAdmin

public Admin getAdmin()
               throws IOException

Caller doesn't close the admin afterwards. We need to manage it and close it properly.

抛出:

IOException

getTable

public Table getTable(String tableName)
               throws IOException

Caller closes the table afterwards.

抛出:

IOException

getRegionLocator

public RegionLocator getRegionLocator(byte[] tableName)
                               throws IOException

Retrieve a regionLocator for the table. The user should close the RegionLocator.

抛出:

IOException

updateConnectionAccessTime

public boolean updateConnectionAccessTime()

Updates the access time for the current connection. Used to keep Connections alive for long-lived scanners.

返回:

whether we successfully updated the last access time