KB4339858 - FIX: Parallel redo does not work after you disable Trace Flag 3459 in an instance of SQL Server

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Symptoms

Assume that you use Always On Availability Groups in Microsoft SQL Server. After you switch to serial redo from parallel redo by enabling Trace Flag 3459, serial redo works as expected. However, when you switch back to parallel redo by disabling Trace Flag 3459, parallel redo does not work. If you restart the instance of SQL Server, parallel redo works as expected.

Resolution

This problem is fixed in the following update for SQL Server:

Cumulative Update 9 for SQL Server 2017 

Cumulative Update 2 for SQL Server 2016 Service Pack 2

Cumulative Update 10 for SQL Server 2016 Service Pack 1

About SQL Server builds

Each new build for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:

The latest build for SQL Server 2017

The latest build for SQL Server 2016

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology Microsoft uses to describe software updates.

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