本文介绍了一个关于LRUMap作为缓存在高并发环境下引发系统挂起的问题。由于LRUMap继承自非线程安全的HashMap，在高并发下会导致系统线程挂起及CPU使用率异常增高。
系统中 一小疏漏，使用 LRUMap作缓存，其继承至abstractHashMap, 因hashmap isn't thead-safe.
并发量大时, 导致客户一系统全部hung住. 只能重启.
后查was也发生过类似问题.
WebSphere Portal 6.1 and 7 is running on WebSphere Application Server 7 which is based on Java 6. The Java 6 HashMap which is not thread-safe is less tolerant to concurrent access under load. This causes the threads accessing the HashMap concurrently to hang and the WebSphere Portal process to incur a higher than normal CPU usage. In Many Cases the hung threads can lead to near 100% CPU usage by the WebSphere Portal process.
http://www-01.ibm.com/support/docview.wss?uid=swg21427374
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