From 7ab4fdf250654780e6232e7e8379fe6b8c881303 Mon Sep 17 00:00:00 2001
From: Alex Vandiver <alexmv@zulip.com>
Date: Thu, 9 Feb 2023 19:24:10 +0000
Subject: [PATCH] memcached: Allow overriding the max-item-size.

This is necessary for organizations with extremely large numbers of
members (20k+).
---
 docs/production/deployment.md                      | 6 ++++++
 puppet/zulip/manifests/profile/memcached.pp        | 1 +
 puppet/zulip/templates/memcached.conf.template.erb | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/docs/production/deployment.md b/docs/production/deployment.md
index 5dd910f6ad..4294cecb1b 100644
--- a/docs/production/deployment.md
+++ b/docs/production/deployment.md
@@ -800,6 +800,12 @@ The version of PostgreSQL that is in use. Do not set by hand; use the
 Override the number of megabytes of memory that memcached should be
 configured to consume; defaults to 1/8th of the total server memory.
 
+#### `max_item_size`
+
+Override the maximum size that an item in memcached can store. This defaults to
+1m; adjusting it should only be necessary if your Zulip server has organizations
+which have more than 20k users.
+
 ### `[loadbalancer]`
 
 #### `ips`
diff --git a/puppet/zulip/manifests/profile/memcached.pp b/puppet/zulip/manifests/profile/memcached.pp
index 52785c2753..1008dff962 100644
--- a/puppet/zulip/manifests/profile/memcached.pp
+++ b/puppet/zulip/manifests/profile/memcached.pp
@@ -18,6 +18,7 @@ class zulip::profile::memcached {
   }
   package { $memcached_packages: ensure => installed }
 
+  $memcached_max_item_size = zulipconf('memcached', 'max_item_size', '1m')
   $memcached_memory = zulipconf('memcached', 'memory', $zulip::common::total_memory_mb / 8)
   file { '/etc/sasl2':
     ensure => directory,
diff --git a/puppet/zulip/templates/memcached.conf.template.erb b/puppet/zulip/templates/memcached.conf.template.erb
index ba8f8acc78..bd8c5dff9c 100644
--- a/puppet/zulip/templates/memcached.conf.template.erb
+++ b/puppet/zulip/templates/memcached.conf.template.erb
@@ -51,3 +51,7 @@ logfile /var/log/memcached.log
 
 # Enable SASL authentication
 -S
+<% if @memcached_max_item_size != '1m' %>
+# Larger max-item-size
+-I <%= @memcached_max_item_size %>
+<% end -%>