问题描述
HTablePool的正确使用模式是什么?我的意思是,假设我有一个用HTablePool实例初始化的DAO。此DAO是无状态会话Bean的成员实例,因此它在调用之间重用。
以下内容的正确用法是什么?
private HTableInterface一张桌子;
$ b $ public XYZDAO(final HTablePool pool)
{
this.aTable = pool.getTable(...);
public void doSomething(...)
{
aTable.get(...)
}
或者HTablePool应该像Datasource一样使用,因此更适合于像这样的用法
private HTablePool datasource;
$ b $ public XYZDAO(final HTablePool池)
{
this.datasource = pool;
}
public void doSomething(...)
{
HTableInterface aTable = datasource.getTable(...);
aTable.get(...);
Table.close();
}
第二种方法是最好的,你应该使用 HTablePool
,因为它是数据源
,因为 HTable
class不是线程安全的。对 HTableInterface
的关闭
方法的调用会自动将表返回到池中。
请注意, HConnection
接口取代了较新HBase版本中不推荐使用的 HTablePool
。
What is the correct usage pattern of HTablePool? I mean, assume that I have my DAO which is initialised with an instance of HTablePool. This DAO is a member instance of a Stateless Session Bean so it is reused between invocations.
What is the correct usage beween the following?
private HTableInterface aTable;
public XYZDAO(final HTablePool pool)
{
this.aTable = pool.getTable(...);
}
public void doSomething(...)
{
aTable.get(...)
}
or HTablePool should be used like a Datasource and therefore is more appropriate a usage like this
private HTablePool datasource;
public XYZDAO(final HTablePool pool)
{
this.datasource = pool;
}
public void doSomething(...)
{
HTableInterface aTable = datasource.getTable(...);
aTable.get(...);
aTable.close();
}
The second approach is the best, you should use HTablePool
like it was a Datasource
since the HTable
class is not thread safe. A call to the close
method of HTableInterface
will automatically return the table to the pool.
Note that there is HConnection
interface that replaces the deprecated HTablePool
in newer HBase versions.
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