From cb6d853b562ec480baa912d3996952bbdfab97c9 Mon Sep 17 00:00:00 2001
From: XuanYang-cn <xuan.yang@zilliz.com>
Date: Tue, 5 Oct 2021 23:12:03 +0800
Subject: [PATCH] [skip ci]Add README.md in datanode (#9311)

Signed-off-by: Yang Xuan <xuan.yang@zilliz.com>
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 internal/datanode/README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 internal/datanode/README.md

diff --git a/internal/datanode/README.md b/internal/datanode/README.md
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+# Data Node
+
+DataNode is the component to write insert and delete messages into persistent blob storage, for example minIO or S3.
+
+## Dependency
+
+- KV store: a kv store that persists messages into blob storage.
+- Message stream: receive messages and publish imformation
+- Root Coordinator: get the latest unique IDs.
+- Data Coordinator: get the flush information and which message stream to subscribe.