Deploying and using Oozie custom action handler.
部署并使用Oozie自定义动作处理程序。
To understand the architecture of the Property Broker, you need to understand what an action handler is.
要理解PropertyBroker的体系结构，您必须理解什么是操作处理程序。
Task instance creation action handler (Listing 15), storing an id of a task instance in process instance context.
任务实例创建动作处理器(清单15)，它保存流程实例上下文的任务实例id。
An exception handler is a kind of action handler, which is invoked when exception occurs during the node execution.
异常处理器也是一种action处理器，当节点执行时出现异常，它将会被调用。
The registerData() method binds the data model to an internal map so that the action handler functions can find it.
registerData()方法将数据模型绑定到一个内部映射，让操作处理程序能够找到它。
This constructor registers the action handler name (invoking super with the action name) that will be used inside workflow XML.
这个构造函数会注册动作处理程序的名称(使用动作名称来调用父类)，我们会在工作流xml中使用它。
Because sending of email is very quick operation, we have decided to implement it as a synchronous action handler, which means that it is executed within Oozie execution context.
因为邮件的发送过程是一种非常快速的操作，所以我们决定将其实现为同步的动作处理程序，那意味着它会在Oozie的执行上下文中执行。
A Decision handler can be configured the same way as the Action handler when implementing Node functionality.
当实现Node功能时，可以像配置Action处理器一样配置Decision处理器。
A Decision handler can be configured the same way as the Action handler when implementing Node functionality.
当实现Node功能时，可以像配置Action处理器一样配置Decision处理器。
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