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Hadoop分布式模式(Hadoop distributed mode)

这个问题可能看起来非常微不足道,但我是Hadoop的新手,目前对一个问题感到困惑。

启动守护进程时,如何在从属节点上放置相应的文件?

我知道您在相应的文件中指定了主服务器和从服务器,但是它如何知道该节点的文件系统上的位置(安装Hadoop的路径)?

我应该为此设置类似HADOOP_HOME(或HADOOP_PREFIX)的东西吗?

另外,我在master文件中读到你只指定了Secondary Name节点,而Name节点和Job Tracker被认为位于你调用start-all.sh的节点上。 但是,如果您没有登录该节点,而是另一个客户端节点,会发生什么? 也许我不太了解那部分......


This question may seem very trivial, but I'm new to Hadoop and currently confused by one question.

When starting the daemons, how can the appropriate files be located on the slave nodes?

I know you specify the masters and the slaves in the appropriate files, but how does it know about the location on the file system of that nodes(the path to where Hadoop is installed)?

Should I perhaps setup something like HADOOP_HOME (or HADOOP_PREFIX) for that?

Also, I read that in masters file you specify only the Secondary Name Node, while the Name Node and Job Tracker are considered to be located on the node from which your are calling start-all.sh. But what happens if you're not logged on that node, but on the other, client node? Maybe I didn't understand that part well...


原文:https://stackoverflow.com/questions/30737172
更新时间:2022-07-10 17:07

最满意答案

  case 0:
  Intent i=new Intent(getApplicationContext(),General_report.class);
  startActivity(i);
  break;

  case 1:
  Intent i1=new Intent(getApplicationContext(),Ipd_report.class);
  startActivity(i1);
  break;

  case 2:
  Intent i11=new Intent(getApplicationContext(),Opd_report.class);
  startActivity(i11); 
  break;

你错过了break; case:后陈述case:


  case 0:
  Intent i=new Intent(getApplicationContext(),General_report.class);
  startActivity(i);
  break;

  case 1:
  Intent i1=new Intent(getApplicationContext(),Ipd_report.class);
  startActivity(i1);
  break;

  case 2:
  Intent i11=new Intent(getApplicationContext(),Opd_report.class);
  startActivity(i11); 
  break;

You missed break; statement after case:

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