Rare race condition during query execution

Detail name	Value
Changelog Number	20594
Type	Bug
Status	Resolved
Affected Versions	Exasol 7.1.26
Fix Versions	Exasol 7.1.27
Resolution Date	2024-05-21

Description

There is a race condition inside the query execution pipeline in Exasol 7.1.26.
As a consequence, SQL statements sometimes crash with “Internal Server Error”.
Database may become unable to receive client connections for up to several minutes if one of internal components hits this error.
Systems with a single database node are unaffected.

Workaround

Execute the affected statement the second time. As this is a race condition, most of the time the execution is successful.

Fix

There are no longer crashes due to this race condition.