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The following page has been changed by Amareshwari: http://wiki.apache.org/lucene-hadoop/HowToDebugMapReducePrograms ------------------------------------------------------------------------------ == How to submit debug script == A quick way to set debug script is to set the properties "mapred.map.task.debug.script" and "mapred.reduce.task.debug.script" for debugging map task and reduce task respectively. These properties can also be set by APIs conf.setMapDebugScript(String script) and conf.setReduceDebugScript(String script). + The debug command is run as $script $stdout $stderr $syslog $jobconf. Task's stdout, stderr, syslog and jobconf files can be accessed inside the script as $1, $2, $3 and $4. In case of streaming, debug script can be submitted with command-line options -mapdebug, -reducedebug for debugging mapper and redcuer respectively. - The debug command is run as $script $stdout $stderr $syslog. Task's stdout, stderr and syslog files can be accessed inside the script as $1, $2 and $3. - In case of streaming, debug script can be submitted with command-line options -mapdebug, -reducedebug for debugging mapper and redcuer respectively. To submit the debug script file, first put the file in dfs. Make sure the property "mapred.create.symlink" is set to "yes". This can also be set by [http://lucene.apache.org/hadoop/api/org/apache/hadoop/filecache/DistributedCache.html#createSymlink(org.apache.hadoop.conf.Configuration) DistributedCache.createSymLink]
