Race condition in IMPERSONATE on systems with many concurrent sessions

Detail name	Value
Changelog Number	12967
Type	Bug
Status	Resolved
Affected Versions	Exasol 7.0.0, Exasol 7.1.0
Fix Versions	Exasol 7.0.14, Exasol 7.1.3
Resolution Date	2021-11-26

Problem

Due to a race condition, the permissions for a user using IMPERSONATE may not be correctly set.
The issue occurs under heavy load--specifically if the system has many active parallel sessions or a high memory load.

Workarounds

• Reduce the number of parallel sessions or the memory load.
• Execute the IMPERSONATE statement as the first statement in a session.

Fix

The issue has been fixed.