KB3206299 - FIX: Availability databases in incorrect initializing/synchronizing state after failover of SQL Server 2014 or 2016 Always On availability group

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Symptoms

Consider the following scenario:

  • You have an Always On availability group with hundreds of databases in Microsoft SQL Server 2014 or 2016.

  • You are running heavy workloads in this availability group.

  • A failover of the availability group occurs.

In this case, the databases in the availability group at the new primary replica may show as Not Synchronizing due to long undo operations, and the databases in the availability group at the new secondary replica may show as Initializing/Synchronizing after the failover due to message handling between replicas. Additionally, error messages that resemble the following are logged in the SQL Server error log:

Error: 35278, Severity: 17, State: 4.
Availability database database_name, which is in the secondary role, is being restarted to resynchronize with the ResyncWithPrimary - Damaged [9] - EOL: 00000047:00000F58:0001 Recovery: FFFFFFFF:FFFFFFFF:0001 Undo: 00000047:00000F70:005F current primary database. This is an informational message only. No user action is required.
ResyncWithPrimary - No Undo Needed [9] - EOL: 00000047:00000F58:0001 Recovery: FFFFFFFF:FFFFFFFF:0001 Undo: 00000047:00000F70:005F

Resolution

This issue is fixed in the following cumulative updates for SQL Server:

Cumulative Update 5 for SQL Server 2016 RTM

Cumulative Update 2 for SQL Server 2016 SP1

Cumulative Update 3 for SQL Server 2014 Service Pack 2

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

Latest cumulative update for SQL Server 2016

Latest cumulative update for SQL Server 2014

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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