Add readme for datacoord (#8141)

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
2021-09-17 23:57:55 +08:00 · 2021-09-17 23:57:55 +08:00 · 266db4c883
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+# 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.