congqixia f51fcc09ae
fix: resolve SessionWatcher goroutine leak and unstable UT in querycoordv2 (#45627)
Related to #44620
Related to unstable ut "internal/querycoordv2 TestServer/TestNodeUp"

Introduce SessionWatcher interface to fix race condition and goroutine
leak that caused unstable unit test TestServer/TestNodeUp.

Changes:
- Add SessionWatcher interface with EventChannel() and Stop() methods
- Refactor WatchServices() to return SessionWatcher instead of raw
channel
- Fix cleanup order in QueryCoordV2: stop watcher before session
- Update DataCoord, ConnectionManager to use SessionWatcher
- Add MockSessionWatcher for testing

Fixes race condition between session context cancellation and internal
loop exit. Eliminates goroutine leak by providing explicit lifecycle
management.

---------

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
2025-11-21 18:33:06 +08:00
..
2023-09-21 09:45:27 +08:00
2023-09-26 17:15:27 +08:00
2021-11-16 15:41:11 +08:00

Data Coordinator

Data cooridnator(datacoord for short) is the component to organize DataNodes and segments allocations.

Dependency

  • KV store: a kv store has all the meta info datacoord needs to operate. (etcd)
  • Message stream: a message stream to communicate statistics information with data nodes. (Pulsar)
  • Root Coordinator: timestamp, id and meta source.
  • Data Node(s): could be an instance or a cluster, actual worker group handles data modification operations.