1.基于哈希的存储引擎
常见模型是BitCask
并发下的数据库文件读写:
本来想使用FileLock,但是后来发现 FileLock是进程间的,并不能用于同一个JVM多个线程之间的同步:
File locks are held on behalf of the entire Java virtual machine.
* They are not suitable for controlling access to a file by multiple
* threads within the same virtual machine.