我在此位置的Start -> Control Panel -> System -> Advanced.
Click on Environment Variables, under System Variables, find PATH, and click on it.
Add python directory to path ,end it with ;
上有一个小csv个文件：hdfs。我在"hdfs://csehadoop/user/department.csv"程序中使用以下代码来读取文件的内容并将其存储在mapreduce中。
hashmap但是，结果brReader = new BufferedReader(new FileReader("hdfs://csehadoop/user/department.csv"));
while ((strLineRead = brReader.readLine()) != null) {
String deptFieldArray[] = strLineRead.split(",");
System.out.println(deptFieldArray[2].toString());
String businessId = deptFieldArray[2].toString();
String fields = deptFieldArray[3].toString() + "\t" + deptFieldArray[10].toString();
DepartmentMap.put(businessId, fields);
}
（hashmap）始终为DepartmentMap。我怎么能纠正这个？
答案 0 :(得分：0)
您无法以这种方式阅读Hdfs文件。您必须在指定的路径处打开FSDataInputStream。例如：
Path pt = new Path("hdfs://csehadoop/user/department.csv");
FileSystem fs = FileSystem.get(context.getConfiguration());
BufferedReader br = new BufferedReader(new InputStreamReader(fs.open(pt)));