I changed the tasktracker.java especially adding special LOG for debugging.
(in main function in TaskTracker.java, I added "LOG.info("Hello!");")
Also, I changed the content of log in TaskTracker.initialize().
(LOG.info("Starting tasktracker with owner as "+
(LOG.info("SSSSSSSSSSStarting tasktracker with owner as "+
And then, using ant jar command, I compiled hadoop source code, and then
redistributed hadoop-core-1.2.1.jar to my cluster nodes.
I re-started my dfs and mapred, then I checked the log file of
TaskTracker.log in my worker node's log directory.
However, it just showed the original log contents, not revised content by
(It shows "2013-12-24 11:50:01,690 INFO
org.apache.hadoop.mapred.TaskTracker: Starting tasktracker with owner as
Please give me a hand to solve this problem.