通过暂停，您是说它挂了，还是只是默默地返回了?对于Mapreduce问题，您应该检查JobTracker的网页(端口50030)以查看已提交作业的状态.

By halt, do you mean it hangs, or that it just silently returns? For Mapreduce issues, you should check the JobTracker's webpage (at port 50030) to see the status of the submitted job.