[IMPALA-6824] Crash in RuntimeProfile::EventSequence::AddNewerEvents() when events_ is empty

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 3.0, Impala 2.12.0
• Fix Version/s: Impala 3.0, Impala 2.12.0
• Component/s: Backend
• Epic Color: ghx-label-7
• Assignee: Lars Volker
• Reporter: Lars Volker
• Created: 09/Apr/18 05:58
• Updated: 07/May/18 23:46
• Resolved: 10/Apr/18 18:10

Description

When events_ is empty in runtime-profile-counters.h:347, events_.back() is undefined. This can lead to a crash. The fix is to check for events_.empty() before calling back().

Issue Links

• is broken by: IMPALA-6190 Add a debug webpage to show fragment instances of a query
• is broken by: IMPALA-6246 Add timeline information to fragment instances in profile