Mahout性能-从数据库加载缓慢

Question

以下建议使用了非常大的客户数据库（数百万个条目），并且加载文件的时间太长。

public static void main(String[] args) throws Exception {

    MysqlDataSource dataSource = new MysqlDataSource ();

    dataSource.setServerName("localhost");
    dataSource.setUser("root");
    dataSource.setPassword("");
    dataSource.setDatabaseName("db_recommend");

    ReloadFromJDBCDataModel model = new ReloadFromJDBCDataModel(new MySQLBooleanPrefJDBCDataModel(dataSource, "table_recommend", "cust_id","item_id" , null));


    UserSimilarity similarity = new LogLikelihoodSimilarity(model);

    UserNeighborhood neighborhood =  new NearestNUserNeighborhood(2, similarity, model);  

    Recommender recommender = new GenericBooleanPrefUserBasedRecommender(model, neighborhood, similarity); 
    Recommender cachingrecommender = new CachingRecommender(recommender);

    cachingrecommender.refresh(null);

    List<RecommendedItem>recommendations =  cachingrecommender.recommend(10001, 3);

    for (RecommendedItem recommendation : recommendations) {
        System.out.println(recommendation);
    }

}

问题在于产生推荐大约需要两分钟。如果部署在Web应用程序中，这将非常慢。关于如何使其运行更快的任何建议？