您需要使用如下所示的jobclientapi：但是api有一些特殊之处。试试看，让我知道我会帮你的。

JobClient client = null;

         Configuration configuration = new Configuration();

        configuration.set("mapred.job.tracker", jobTrackerURL);
        client = new JobClient(new JobConf(configuration));

        while (true) {

            List<JobStatus> jobEntries = getTrackerEntries(jobName,
                        client);

                    for (JobStatus jobStatus : jobEntries) {

                        JobID jobId = jobStatus.getJobID();
                        String trackerJobName = client.getJob(jobId)
                                .getJobName();
                        TaskReport[] mapReports = client
                                .getMapTaskReports(jobId);
                        TaskReport[] reduceReports = client
                                .getReduceTaskReports(jobId);
                        client.getJob(jobId).getJobStatus().getStartTime();

                        int jobMapper = mapReports.length;
                        mapNumber = +jobMapper;
                        int jobReducers = reduceReports.length;
                        reduceNumber = +jobReducers;

                    }
                }