[HADOOP-2947] [HOD] Hod should redirect stderr and stdout of Hadoop daemons to assist debugging

• Type: Improvement
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.16.0
• Fix Version/s: 0.17.0
• Component/s: contrib/hod
• Hadoop Flags: Reviewed
• Release Note: The stdout and stderr streams of daemons are redirected to files that are created under the hadoop log directory. Users can now send kill 3 signals to the daemons to get stack traces and thread dumps for debugging.
• Assignee: Vinod Kumar Vavilapalli
• Reporter: Hemanth Yamijala
• Created: 06/Mar/08 08:24
• Updated: 21/May/08 20:05
• Resolved: 02/Apr/08 05:17

Description

Copied from internal bug details from Koji:

==========================
Sometimes JobTracker/TaskTracker starts consuming 99% cpu and stops responding to 'jstack' call. In those cases,
usually it still responds to kill -QUIT signal which forces the jvm to dump the stack to stdout.

Please have the stdout of JT/TT redirected to a file.

Adding stderr.
If thread has an uncaught exception, it prints out to stderr and dies.
==========================