[HADOOP-13323] Downgrade stack trace on FS load from Warn to debug

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.3
• Fix Version/s: 2.8.0, 3.0.0-alpha2
• Component/s: fs
• Hadoop Flags: Reviewed
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 27/Jun/16 13:37
• Updated: 18/Oct/16 22:05
• Resolved: 06/Oct/16 18:05

Description

HADOOP-12636 catches exceptions on FS creation, but prints a stack trace @ warn every time..this is noisy and irrelevant if the installation doesn't need connectivity to a specific filesystem or object store.

I propose: only printing the toString values of the exception chain @ warn; the full stack comes out at debug.

We could some more tuning:

• have a specific log for this exception, which allows installations to turn even the warnings off.
• add a link to a wiki page listing the dependencies of the shipped filesystems

Issue Links

• is depended upon by: HADOOP-11694 Über-jira: S3a phase II: robustness, scale and performance
• is related to: HADOOP-12636 Prevent ServiceLoader failure init for unused FileSystems