[YARN-476] ProcfsBasedProcessTree info message confuses users

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.3-alpha, 0.23.6
• Fix Version/s: 2.1.0-beta, 0.23.8
• Hadoop Flags: Reviewed
• Assignee: Sandy Ryza
• Reporter: Jason Darrell Lowe
• Created: 13/Mar/13 22:47
• Updated: 27/Aug/13 22:15
• Resolved: 17/Apr/13 23:12

Description

ProcfsBasedProcessTree has a habit of emitting not-so-helpful messages such as the following:

2013-03-13 12:41:51,957 INFO [communication thread] org.apache.hadoop.yarn.util.ProcfsBasedProcessTree: The process 28747 may have finished in the interim.
2013-03-13 12:41:51,958 INFO [communication thread] org.apache.hadoop.yarn.util.ProcfsBasedProcessTree: The process 28978 may have finished in the interim.
2013-03-13 12:41:51,958 INFO [communication thread] org.apache.hadoop.yarn.util.ProcfsBasedProcessTree: The process 28979 may have finished in the interim.

As described in MAPREDUCE-4570, this is something that naturally occurs in the process of monitoring processes via procfs. It's uninteresting at best and can confuse users who think it's a reason their job isn't running as expected when it appears in their logs.

We should either make this DEBUG or remove it entirely.