From 792afb443211f190b3f8bea15e945661453fbddf Mon Sep 17 00:00:00 2001
From: ny0312 <49037844+ny0312@users.noreply.github.com>
Date: Thu, 16 Dec 2021 21:56:59 -0800
Subject:  Introduce memory management on cluster link buffers (#9774)

Introduce memory management on cluster link buffers:
 * Introduce a new `cluster-link-sendbuf-limit` config that caps memory usage of cluster bus link send buffers.
 * Introduce a new `CLUSTER LINKS` command that displays current TCP links to/from peers.
 * Introduce a new `mem_cluster_links` field under `INFO` command output, which displays the overall memory usage by all current cluster links.
 * Introduce a new `total_cluster_links_buffer_limit_exceeded` field under `CLUSTER INFO` command output, which displays the accumulated count of cluster links freed due to `cluster-link-sendbuf-limit`.
---
 redis.conf | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'redis.conf')

diff --git a/redis.conf b/redis.conf
index b2810996d..1350ac96d 100644
--- a/redis.conf
+++ b/redis.conf
@@ -1576,6 +1576,17 @@ lua-time-limit 5000
 #
 # cluster-allow-reads-when-down no
 
+# Cluster link send buffer limit is the limit on the memory usage of an individual
+# cluster bus link's send buffer in bytes. Cluster links would be freed if they exceed
+# this limit. This is to primarily prevent send buffers from growing unbounded on links
+# toward slow peers (E.g. PubSub messages being piled up).
+# This limit is disabled by default. Enable this limit when 'mem_cluster_links' INFO field
+# and/or 'send-buffer-allocated' entries in the 'CLUSTER LINKS` command output continuously increase.
+# Minimum limit of 1gb is recommended so that cluster link buffer can fit in at least a single
+# PubSub message by default. (client-query-buffer-limit default value is 1gb)
+#
+# cluster-link-sendbuf-limit 0
+
 # In order to setup your cluster make sure to read the documentation
 # available at https://redis.io web site.
 
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