jobtracker有一个api，用于在网络环境中提交和跟踪mr作业。查看此项了解更多详细信息。https://hadoop.apache.org/docs/r1.0.4/api/org/apache/hadoop/mapred/jobtracker.html

TaskReport[] maps = jobtracker.getMapTaskReports("job_id");
    for (TaskReport rpt : maps) {
      System.out.println(rpt.getStartTime());  
      System.out.println(rpt.getFinishTime());
    }
    TaskReport[] reduces = jobtracker.getReduceTaskReports("job_id");
    for (TaskReport rpt : reduces) {
      System.out.println(rpt.getStartTime());
System.out.println(rpt.getFinishTime());
    }

或者，如果您使用的是hadoop2.x，那么已经提供了resourcemanagerrestapi。
https://hadoop.apache.org/docs/r2.6.0/hadoop-yarn/hadoop-yarn-site/resourcemanagerrest.html
https://hadoop.apache.org/docs/r2.6.0/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/historyserverrest.html