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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>
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.