1. You can if you copy the cfg file into HDFS. Otherwise, it's local to one node, and can't be accessed by map/reduce jobs running on other nodes.
2. You can write your own RecordReader/InputFormat classes and handle input files in any formats of your own. Nathan -----Original Message----- From: Hua Wei [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 19, 2008 7:45 AM To: core-user@hadoop.apache.org Subject: 2 questions about hadoopifying Hi, I got 2 questions when hadoopifying my old programs. 1. How to access an exterior configuration file (not an input file) in mapper class? Every mapper need to read this XML file for parameters. Is there a solution to this? 2. Is there any limitation about what kind of data structures can be used in a mapper or reducer class? Say, can hashMap or self-defined class be used within a mapper class? I am new to hadoop. Any response would be appreciated.
