[8.x]: Prevent redis crash when large number of jobs are scheduled fo…

src/Illuminate/Queue/Connectors/RedisConnector.php

@@ -47,7 +47,8 @@ public function connect(array $config)
             $config['connection'] ?? $this->connection,
             $config['retry_after'] ?? 60,
             $config['block_for'] ?? null,
-            $config['after_commit'] ?? null
+            $config['after_commit'] ?? null,
+            $config['migration_batch_size'] ?? -1
         );
     }
 }

src/Illuminate/Queue/LuaScripts.php

@@ -106,7 +106,7 @@ public static function migrateExpiredJobs()
     {
         return <<<'LUA'
 -- Get all of the jobs with an expired "score"...
-local val = redis.call('zrangebyscore', KEYS[1], '-inf', ARGV[1])
+local val = redis.call('zrangebyscore', KEYS[1], '-inf', ARGV[1], 'limit', 0, ARGV[2])
 
 -- If we have values in the array, we will remove them from the first queue
 -- and add them onto the destination queue in chunks of 100, which moves

src/Illuminate/Queue/RedisQueue.php

@@ -45,6 +45,15 @@ class RedisQueue extends Queue implements QueueContract, ClearableQueue
      */
     protected $blockFor = null;
 
+    /**
+     * The batch size to use when migrating delayed / expired jobs onto the primary queue.
+     *
+     * Negative values are infinite.
+     *
+     * @var int
+     */
+    protected $migrationBatchSize = -1;
+
     /**
      * Create a new Redis queue instance.
      *
@@ -54,21 +63,24 @@ class RedisQueue extends Queue implements QueueContract, ClearableQueue
      * @param  int  $retryAfter
      * @param  int|null  $blockFor
      * @param  bool  $dispatchAfterCommit
+     * @param  int  $migrationBatchSize
      * @return void
      */
     public function __construct(Redis $redis,
                                 $default = 'default',
                                 $connection = null,
                                 $retryAfter = 60,
                                 $blockFor = null,
-                                $dispatchAfterCommit = false)
+                                $dispatchAfterCommit = false,
+                                $migrationBatchSize = -1)
     {
         $this->redis = $redis;
         $this->default = $default;
         $this->blockFor = $blockFor;
         $this->connection = $connection;
         $this->retryAfter = $retryAfter;
         $this->dispatchAfterCommit = $dispatchAfterCommit;
+        $this->migrationBatchSize = $migrationBatchSize;
     }
 
     /**
@@ -244,7 +256,7 @@ protected function migrate($queue)
     public function migrateExpiredJobs($from, $to)
     {
         return $this->getConnection()->eval(
-            LuaScripts::migrateExpiredJobs(), 3, $from, $to, $to.':notify', $this->currentTime()
+            LuaScripts::migrateExpiredJobs(), 3, $from, $to, $to.':notify', $this->currentTime(), $this->migrationBatchSize
         );
     }