From 110b653c2d5e429f36bb05d08291cc6e077c3976 Mon Sep 17 00:00:00 2001
From: asahi <mikiyashiki@outlook.com>
Date: Thu, 11 Sep 2025 17:29:24 +0800
Subject: [PATCH] =?UTF-8?q?doc:=20=E9=98=85=E8=AF=BBredis=20stream?=
 =?UTF-8?q?=E6=96=87=E6=A1=A3?=
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---
 中间件/redis/redis.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/中间件/redis/redis.md b/中间件/redis/redis.md
index 0c7347f..266b49d 100644
--- a/中间件/redis/redis.md
+++ b/中间件/redis/redis.md
@@ -100,6 +100,7 @@
         - [XREAD with STREAMS option](#xread-with-streams-option)
         - [XREAD with BLOCK argument](#xread-with-block-argument)
       - [Consumer groups](#consumer-groups)
+        - [Creating a consumer group](#creating-a-consumer-group)
 
 
 # redis
@@ -1655,3 +1656,14 @@ consumer group包含如下的基本命令：
 - XACK
 - XACKDEL
 
+##### Creating a consumer group
+可以通过如下方式来为stream创建一个consumer group：
+```redis-cli
+> XGROUP CREATE race:france france_riders $
+OK
+```
+在上述示例中，在通过command创建consumer group时，以`$`的形式指定了一个`ID`。该ID是必要的，该ID将作为consumer group创建时的`last message ID`，在第一个consumer连接时，会根据向consumer传递`大于last message ID的消息`。
+- 当将last message ID指定为`$`时，只有`new messages arriving in the stream from now on`会被传递给consumer group中的consumer instances。由于`$`代表`current greatest ID in the stream`，指定`$`代表`consuming only new messages`
+- 如果在此处指定了`0`，那么consumer group将会消费`all the messages in the stream history`
+- 此处，也可以指定其他的`valid ID`，`consumer group will start delivering messages that are greater than the ID you specify`
+