Timeout occurred while waiting for latch: class 'COLUMNSTORE_ROWGROUP_COLLECTION'

　　今天发现线上数据库主从延迟严重：

SELECT ag.name AS ag_name, ar.replica_server_name AS ag_replica_server, dr_state.database_id as database_id,
dr_state.redo_queue_size, is_ag_replica_local = CASE
WHEN ar_state.is_local = 1 THEN N'LOCAL'
ELSE 'REMOTE'
END ,
ag_replica_role = CASE
WHEN ar_state.role_desc IS NULL THEN N'DISCONNECTED'
ELSE ar_state.role_desc
END
FROM (( sys.availability_groups AS ag JOIN sys.availability_replicas AS ar ON ag.group_id = ar.group_id )
JOIN sys.dm_hadr_availability_replica_states AS ar_state ON ar.replica_id = ar_state.replica_id)
JOIN sys.dm_hadr_database_replica_states dr_state on
ag.group_id = dr_state.group_id and dr_state.replica_id = ar_state.replica_id;

从库大量日志没有做，当时就想到可能是从库有事物没有执行完毕，查看了一下未结束的事物和锁信息，发现并不是这个原因，查看错误日志：

消息
Timeout occurred while waiting for latch: class 'COLUMNSTORE_ROWGROUP_COLLECTION', id 00000030F72767A0, type 4, Task 0x00000030FF058CA8 : 0, waittime 44400 seconds, flags 0x1a, owning task 0x00000030FF058CA8. Continuing to wait.

我擦，这不是上次碰到的问题吗，假定您启用 Microsoft SQL Server 2014年的 AlwaysOn 可用性组功能。在 rowgroups 转换为压缩的状态将导致在主站点上聚集 Columnstore 索引 (CCI) 为插入数据时，在辅助站点上的重做线程可能会遇到闩锁超时错误。COLUMNSTORE_ROWGROUP_COLLECTION内部锁争用，这里说明下，这是SQL Server2014  12.0.2000的一个BUG，列存储锁争用，我们需要升级补丁或者重启数据库才能够解决，我是碰到两次了，最终解决办法就是给从库打了一个补丁，完美解决。