Hadoop在Map阶段获取当前split的文件名

在mapper处理阶段中有时候我们需要获取当前正在处理的HDFS文件名/HDFS目录名，其实我们可以通过 Context 来获取相关参数，代码类似如下：

FileSplit fileSplit = (FileSplit) context.getInputSplit();

System.out.println("========> getPath.getName = " + fileSplit.getPath().getName());

System.out.println("========> getPath = " + fileSplit.getPath().toString());

System.out.println("========> getPath.getParent = " + fileSplit.getPath().getParent().toString());

System.out.println("========> getPath.getParent.getName() = " + fileSplit.getPath().getParent().getName());

输出的日志信息如下：

========> getPath.getName = fatal_2015-02-05-04.log

========> getPath = hdfs://mycluster/user/micmiu/demo/nsplog/2015/02/05/7/fatal_2015-02-05-04.log

========> getPath.getParent = hdfs://mycluster/user/micmiu/demo/nsplog/2015/02/05/7

========> getPath.getParent.getName() = 7

(责任编辑：IT)