19421

Product

Name

Event ID

19421

Event Source

MSSQLSERVER

Component

SQLEngine

Symbolic

Name

HADR_AG_LEASE_RENEWAL_TIMEOUT

Message Text

hosting availability group ’%.*ls’ did not receive a process event signal from

the Windows Server Failover Cluster within the lease timeout period.

Error 19421 is raised in the SQL Server error log when the lease helper on the Windows cluster

side didn’t signal the SQL Server lease worker thread within the pre-defined lease period.

Specifically, SQL Server calls

WaitForMultipleObjects()

waiting for the Lease timeout event to be

set in a signaled state. If the function returns WAIT_TIMEOUT, because it has exceeded the

specified Lease interval, then error 19421 is raised.

A lease is a time-based communication mechanism that takes place between the SQL Server

and the Windows Server Failover Cluster (WSFC) process, specifically the RHS.EXE process. The

two processes communicate with each other periodically to ensure the other process is running

and responding. This communication takes place using Windows

Event objects

and ensures

that a failover of the AG resource doesn’t occur without the knowledge of the WSFC. If one of

the processes doesn’t respond to the lease communication based on a predefined lease

period, a lease timeout occurs. For detailed information, see

Mechanics and guidelines of lease,

cluster, and health check timeouts for Always On availability groups. Also see

How It Works:

Always On Lease Timeout.

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