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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();
}


解决方案

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 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();
}
解决方案

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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09-22 18:29