From db497e5d7e903c1fdfd412ec40e37b316cd97ada Mon Sep 17 00:00:00 2001
From: Karsten Dambekalns <karsten@dambekalns.de>
Date: Thu, 18 Apr 2024 10:19:29 +0200
Subject: [PATCH 1/2] BUGFIX: Add exponential backoff when reading from Redis

Fixes #3284
---
 Neos.Cache/Classes/Backend/RedisBackend.php | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Neos.Cache/Classes/Backend/RedisBackend.php b/Neos.Cache/Classes/Backend/RedisBackend.php
index ee0fb006c0..7b19872a44 100644
--- a/Neos.Cache/Classes/Backend/RedisBackend.php
+++ b/Neos.Cache/Classes/Backend/RedisBackend.php
@@ -170,7 +170,18 @@ private function calculateExpires(string $tag, int $lifetime): int
      */
     public function get(string $entryIdentifier): string|bool
     {
-        return $this->uncompress($this->redis->get($this->getPrefixedIdentifier('entry:' . $entryIdentifier)));
+        $tries = 1;
+        do {
+            try {
+                return $this->uncompress($this->redis->get($this->getPrefixedIdentifier('entry:' . $entryIdentifier)));
+            } catch (\RedisException  $exception) {
+                if ($tries > 8) {
+                    throw $exception;
+                }
+                usleep($tries^2 * 100000);
+                $tries++;
+            }
+        } while (true);
     }
 
     /**

From 1f63a30cd5b497ba85359742d6662dc08867f7db Mon Sep 17 00:00:00 2001
From: Karsten Dambekalns <karsten@dambekalns.de>
Date: Mon, 29 Apr 2024 13:07:29 +0200
Subject: [PATCH 2/2] Use ** instead of ^ for exponentiation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

🙈
---
 Neos.Cache/Classes/Backend/RedisBackend.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Neos.Cache/Classes/Backend/RedisBackend.php b/Neos.Cache/Classes/Backend/RedisBackend.php
index 7b19872a44..1229d7b381 100644
--- a/Neos.Cache/Classes/Backend/RedisBackend.php
+++ b/Neos.Cache/Classes/Backend/RedisBackend.php
@@ -178,7 +178,7 @@ public function get(string $entryIdentifier): string|bool
                 if ($tries > 8) {
                     throw $exception;
                 }
-                usleep($tries^2 * 100000);
+                usleep($tries**2 * 100000);
                 $tries++;
             }
         } while (true);