XuanYang-cn a77dd1034c
Adopt the extended state in DataCoord (#16200)
ChannelWatchInfo with ToWatch, ToRelease will trigger a timer.
ChannelManager now reacts to different ChannelWatch states.

- WatchSuccess > log this info

- WatchFailure/WatchTimeout > ToRelease

- ReleaseSuccess > Delete, reassign if not from DropCollection

- ReleaseFailure/ReleaseTimeout > Cleanup subscription and Delete,
  reassgin if not from DropCollection.

Some Notes:
1. Reassignment will add this channel to buffer if there's only one node.

See also: #15846

Signed-off-by: yangxuan <xuan.yang@zilliz.com>
2022-03-28 22:33:27 +08:00
..
2022-02-18 18:29:50 +08:00
2022-03-15 21:51:21 +08:00
2022-03-21 15:47:23 +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.