Task logs are written to userlogs directory on the TT nodes. You can view task logs on the JobTracker/TaskTracker web UI for each task at:
http://machine:50030/taskdetails.jsp?jobid=<JOBID>&tipid=<TASKID> All of syslogs, stdout and stderr logs are available in the links to logs off that page. 2011/7/28 Daniel,Wu <[email protected]>: > Hi everyone, > > I am new to it, and want to do some debug/log. I'd like to check what the > value is for each mapper execution. If I add the following code in bold, > where can I find the log info? If I can't do it in this way, how should I do? > > public void map(Object key, Text value, Context context > ) throws IOException, InterruptedException { > StringTokenizer itr = new StringTokenizer(value.toString()); > System.out.println(value.toString); > while (itr.hasMoreTokens()) { > word.set(itr.nextToken()); > context.write(word, one); > } > } > } -- Harsh J
