如何在Spark中使用不是线程安全的3rdParty依赖项？

Question

如何＆＃34;线程安全＆＃34;是Spark吗？我在java中有这样的东西：

class A implements Function<String, Boolean> {
    NotThreadSafe3rdParty calculator = new NotThreadSafe3rdParty();
    public Boolean call(String s) {
        return calculator.calc(s);
    }
}

class B implements Function<String, Boolean> {
    static NotThreadSafe3rdParty calculator;
    static {
        calculator = new NotThreadSafe3rdParty();
    }
    public Boolean call(String s) {
        return calculator.calc(s);
    }
}

class MyRun {
    public static void main(String[] args) {
        String myPath = "/data/path";
        SparkConf conf = new SparkConf().setAppName("Simple Application");
        JavaSparkContext sc = new JavaSparkContext(conf);
        JavaRDD<String> myData = sc.textFile(myPath);

        long numAs = myData.filter(new A()).count();
        long numBs = myData.filter(new B()).count();
    }
}

1. A类的使用是否正确？
2. B类的使用是否正确？
3. 如果A类NotThreadSafe3rdParty是c代码的jni包装器（例如crfsuite？）
怎么办？
4. 如何正确使用此类依赖项？