hadoop获取当前正在运作job数量的代码

// 我在这里只有一个Queue，名字叫做default，so，硬编码了。

	Configuration conf = new Configuration();
		conf.set("mapred.job.tracker", "YOUR_MAP_REDUCE_URL");
		JobClient client;
		try {
			client = new JobClient(new JobConf(conf));
			System.out.println(client.getQueues()[0].getQueueName());
			System.out.println(client.getJobsFromQueue(client.getQueues()[0].getQueueName()).length);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}

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