[TEZ-3534] Differentiate thread names on Fetchers, minor changes to shuffle shutdown code

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0, 0.8.5
• Target Version/s: 0.8.5
• Assignee: Siddharth Seth
• Reporter: Siddharth Seth
• Created: 09/Nov/16 23:45
• Updated: 14/Mar/17 03:49
• Resolved: 11/Nov/16 18:11

Description

Follow up to https://issues.apache.org/jira/browse/TEZ-3533.
Adding some exception checks during shutdown could help with ensuring all components shutdown, in case there is a failure from a previous one.
Rename threads is to make it easier to debug from stacktraces.