如何在MapReduce的配置对象中将整数数组作为属性值传递？

我们可以将整数作为配置属性传递，如下所示：

Configuration conf = new Configuration();
conf.set("size", 4);

有没有办法将整数数组作为属性值发送

conf.set("list.of.nums", {2, 4, 6, 8}); // one way is to pass them as a String but it doesn't look good

---

您可以将数组对象序列化为一个文件，然后将该文件移动到HDFS

DistributedCache.addCacheFile(new URI(dfsMetaPath + "#"
                + Constants.OBJSYMLINK0), conf);
        DistributedCache.createSymlink(conf);

序列化可以按如下方式进行：-

public static <T> void serializeMetadata(T voObj,
        String filePath) throws IOException,NullPointerException {

    if(null==voObj){
        throw new NullPointerException("NULL object found");
    }

    ObjectOutputStream oout = null;
    FileOutputStream fsout = null;
    try {
        fsout = new FileOutputStream(filePath);
        oout = new ObjectOutputStream(fsout);
        oout.writeObject(voObj);
        oout.close();
    } finally {
        if (null != fsout) {
            fsout.close();
        }
        if (null != oout) {
            oout.close();
        }
    }
}

对于反序列化，可以使用以下代码：-

public static <T> T deserializeMetadata(T voObj,
        String filePath) throws IOException,NullPointerException, ClassNotFoundException {

    FileInputStream fsin = null;
    ObjectInputStream oin = null;
    try {
        fsin = new FileInputStream(filePath);
        oin = new ObjectInputStream(fsin);
        voObj = (T) oin.readObject();
        return voObj;

    } finally {
        if (null != fsin) {
            fsin.close();
        }
        if (null != oin) {
            oin.close();
        }
    }
}

公共静态T反序列化元数据（T voObj，
字符串文件路径）引发IOException、NullPointerException、ClassNotFoundException{
FileInputStream fsin=null；
ObjectInputStream oin=null；
试一试{
fsin=新文件输入流（文件路径）；
oin=新对象输入流（fsin）；
voObj=（T）oin.readObject（）；
返回voObj；
}最后{
如果（空！=fsin）{
fsin.close（）；
}
if（null！=oin）{
oin.close（）；
}
}
}

public static <T> T deserializeMetadata(T voObj,
        String filePath) throws IOException,NullPointerException, ClassNotFoundException {

    FileInputStream fsin = null;
    ObjectInputStream oin = null;
    try {
        fsin = new FileInputStream(filePath);
        oin = new ObjectInputStream(fsin);
        voObj = (T) oin.readObject();
        return voObj;

    } finally {
        if (null != fsin) {
            fsin.close();
        }
        if (null != oin) {
            oin.close();
        }
    }
}