[IMPALA-4327] warn when running out of fe-service-threads

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Impala 2.5.0
• Component/s: Distributed Exec
• Labels: supportability
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Marcell Szabo
• Created: 20/Oct/16 16:32
• Updated: 26/Nov/18 23:07

Description

Add a warning message into the log when the number of --fe-service-threads is maxed out.
The warning should be something like:
"All service threads are occupied, please consider setting up a load balancer or increasing --fe-service-threads from %d"