MG4J (Managing Gigabytes for Java) is a free full-text search engine for large document collections written in Java.

MG4J 是另一个搜索engine 。与Lucene 主要区别是，它提供了cluster 功能，具有更OO的设计方式-MG4J is another search engine. The main difference with Lucene is that it provides a cluster function, with a more OO design