[IMPALA-4329] Crash in scheduler when no backends are registered

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 2.7.0
• Fix Version/s: Impala 2.8.0
• Component/s: Backend
• Target Version: Impala 2.8.0
• Assignee: Lars Volker
• Reporter: Lars Volker
• Created: 20/Oct/16 20:39
• Updated: 03/Nov/16 01:38
• Resolved: 21/Oct/16 03:28

Description

The scheduler will crash when there are no backends registered and therefore the backend_config_ is empty. We should return an error instead, since without backend a query cannot be scheduled in a meaningful way. I will push a fix shortly.