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最近在试用Hbase1.0的客户端API，发觉变化还是挺大（以前版本也不熟）。到处都是deprecated。
现在应该是这样子：
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "quorum1,quorum2,quorum3");
conf.set("hbase.zookeeper.property.clientPort", "2181");
connection = ConnectionFactory.createConnection(conf);// HBase 0.99+
//connection = HConnectionManager.createConnection(conf); // HBase <0.99
Table table = connection.getTable(TableName.valueOf("TestTable"));
新的客户端API中，Connection处于关键位置，以下api说明翻译下：
ConnectionFactory class.
The lifecycle of the connection is managed by the caller, who has to close() the
connection to release the resources.
The connection object contains logic to find the master, locate
regions out on the cluster, keeps a cache of locations and then knows
how to re-calibrate after they move. The individual connections to
servers, meta cache, zookeeper connection, etc are all
shared by the Table and Admin instances
obtained from this connection.
Connection creation is a heavy-weight operation. Connection
implementations are thread-safe, so that the client can create a
connection once, and share it with different threads. Table and Admin instances,
on the other hand, are light-weight and are not thread-safe. Typically,
a single connection per client application is instantiated and every
thread will obtain its own Table instance. Caching or pooling of Table and Admin is
not recommended.
This class replaces HConnection,
which is now deprecated.
ConnectionFactory类实例化。Connection的生命周期由调用者维护，调用者通过调用close()，释放资源。
关于 ConnectionFactory.createConnection函数的说明：
public static Connection createConnection(org.apache.hadoop.conf.Configuration conf)
conf instance. Connection encapsulates all housekeeping for a connection to the cluster. All tables and interfaces created from returned connection share zookeeper connection, meta cache, and connections to region servers and masters. Connection.close() on
the returned connection instance.Connection also
returns Admin and RegionLocator implementations标签：
原文地址：http://www.cnblogs.com/hyl8218/p/5492489.html
