Distributed Locking: Add ROWLOCK hint to prevent cross-row contention on umbracoLock table (closes #22113) (#22126)

Use row lock for lock table.

Author: AndyButland

src/Umbraco.Cms.Persistence.EFCore/Locking/SqlServerEFCoreDistributedLockingMechanism.cs

@@ -157,7 +157,7 @@ private void ObtainReadLock()
                         "A transaction with minimum ReadCommitted isolation level is required.");
                 }
 
-                var number = await dbContext.Database.ExecuteScalarAsync<int?>($"SET LOCK_TIMEOUT {(int)_timeout.TotalMilliseconds};SELECT value FROM dbo.umbracoLock WITH (REPEATABLEREAD) WHERE id={LockId}");
+                var number = await dbContext.Database.ExecuteScalarAsync<int?>($"SET LOCK_TIMEOUT {(int)_timeout.TotalMilliseconds};SELECT value FROM dbo.umbracoLock WITH (ROWLOCK, REPEATABLEREAD) WHERE id={LockId}");
 
                 if (number == null)
                 {
@@ -190,7 +190,7 @@ private void ObtainWriteLock()
                 }
 
 #pragma warning disable EF1002
-                var rowsAffected = await dbContext.Database.ExecuteSqlRawAsync(@$"SET LOCK_TIMEOUT {(int)_timeout.TotalMilliseconds};UPDATE umbracoLock WITH (REPEATABLEREAD) SET value = (CASE WHEN (value=1) THEN -1 ELSE 1 END) WHERE id={LockId}");
+                var rowsAffected = await dbContext.Database.ExecuteSqlRawAsync(@$"SET LOCK_TIMEOUT {(int)_timeout.TotalMilliseconds};UPDATE umbracoLock WITH (ROWLOCK, REPEATABLEREAD) SET value = (CASE WHEN (value=1) THEN -1 ELSE 1 END) WHERE id={LockId}");
 #pragma warning restore EF1002
 
                 if (rowsAffected == 0)

src/Umbraco.Cms.Persistence.SqlServer/Services/SqlServerDistributedLockingMechanism.cs

@@ -144,7 +144,7 @@ private void ObtainReadLock()
                     "A transaction with minimum ReadCommitted isolation level is required.");
             }
 
-            const string query = "SELECT value FROM umbracoLock WITH (REPEATABLEREAD)  WHERE id=@id";
+            const string query = "SELECT value FROM umbracoLock WITH (ROWLOCK, REPEATABLEREAD) WHERE id=@id";
 
             var lockTimeoutQuery = $"SET LOCK_TIMEOUT {_timeout.TotalMilliseconds}";
 
@@ -180,7 +180,7 @@ private void ObtainWriteLock()
             }
 
             const string query =
-                @"UPDATE umbracoLock WITH (REPEATABLEREAD) SET value = (CASE WHEN (value=1) THEN -1 ELSE 1 END) WHERE id=@id";
+                @"UPDATE umbracoLock WITH (ROWLOCK, REPEATABLEREAD) SET value = (CASE WHEN (value=1) THEN -1 ELSE 1 END) WHERE id=@id";
 
             var lockTimeoutQuery = $"SET LOCK_TIMEOUT {_timeout.TotalMilliseconds}";