issue: #43828
Implement robust rewatch mechanism to handle etcd connection failures
and node reconnection scenarios in DataCoord and QueryCoord, along with
heartbeat lag monitoring capabilities.
Changes include:
- Implement rewatchDataNodes/rewatchQueryNodes callbacks for etcd
reconnection scenarios
- Add idempotent rewatchNodes method to handle etcd session recovery
gracefully
- Add QueryCoordLastHeartbeatTimeStamp metric for monitoring node
heartbeat lag
- Clean up heartbeat metrics when nodes go down to prevent metric leaks
---------
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
See also #33062
This PR:
- Add `lock.RWMutex` & `lock.Mutex` alias to switch implementation based
on build flags
- When build flags has `test` in it, use `go-deadlock` to detect
possible deadlocks
- Replace all `sync.RWMutex` & `sync.Mutex` in datacoord pkg
Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
