检测内存不足错误 [英] Detecting out of memory errors

问题描述

我想向我的系统提供一种检测内存异常是否发生的方法。这项工作的目的是通过JMX公开这个标志，并相应地采取行动（例如通过在监控系统上配置相关的警报），否则这些错误就被忽视了几天。

I would like to provide my system with a way of detecting whether out of memory exception has occurred or not. The aim for this exercise is to expose this flag through JMX and act correspondingly (e.g. by configuring a relevant alert on the monitoring system), as otherwise these errors sit unnoticed for days.

这样做的初衷是设置一个未捕获的异常处理程序< a>对于每个线程，并检查引发的异常是否为 OutOfMemoryError 的实例，并设置相关标志。但是，由于以下原因，这种方法是不现实的：

Naive approach for this would be to set an uncaught exception handler for every thread and check whether the raised exception is instance of OutOfMemoryError and set a relevant flag. However, this approach isn't realistic for the following reasons:

• 该异常可能发生在任何地方，包括第三方库。没有什么可以做，以防止他们捕捉 Throwable 并保持自己。


• 库可以产生自己的线程，我有没有办法为这些线程执行未捕获的异常处理程序。

• The exception can occur anywhere, including 3rd party libraries. There is nothing I can do to prevent them catching Throwable and keeping it for themselves.
• Libraries can spawn their own threads and I have no way of enforcing uncaught exception handlers for these threads.

我看到的一种可能的方案是字节码操作（例如附加某种方面在 OutOfMemoryError 的顶部），但是我不知道这是否正确的方法，或者这是否可行。

One of possible scenarios I see is bytecode manipulation (e.g. attaching some sort of aspect on top of OutOfMemoryError), however I am not sure if that's right approach or whether this is doable in general.

我们已经启用了 -XX：+ HeapDumpOnOutOfMemoryError ，但是我并没有看到这是解决这个问题的方法，因为它是为别的东西而设计的 - 它不提供Java回调当这种情况发生时。

We have -XX:+HeapDumpOnOutOfMemoryError enabled, but I don't see this as a solution for this problem as it was designed for something else - and it provides no Java callback when this happens.

有没有人这样做？你会如何解决它或建议解决它？欢迎任何想法。

Has anyone done this? How would you solve it or suggest solving it? Any ideas are welcome.

推荐答案

您可以使用内存不足警告系统;这个 http://www.javaspecialists.eu/archive/Issue092.html 可以灵感。您可以配置在某个内存阈值（例如80％）被触发后调用的侦听器 - 您可以使用此调用开始采取纠正措施。

You could use an out of memory warning system; this http://www.javaspecialists.eu/archive/Issue092.html can be an inspiration. You could configure a listener which is invoked after a certain memory threshold ( say 80%) is breached - you can use this invocation to start taking corrective measures.

我们使用某些东西类似地，当组件的内存阈值达到80％并启动清理操作时，我们暂停组件的服务;只有当使用的内存低于另一个可配置值阈值时，组件才会返回。

We use something similar, where we suspend the component's service when the memory threshold of the component reaches 80% and start the clean up action; the component comes back only when the used memory comes below a another configurable value threshold.

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