redis: Remove worker heartbeat compatibility code

docs/source/changelog.rst

@@ -50,10 +50,17 @@ These are changes that while technically breaking, we believe are unlikely to ef
 * The deprecated ``requeue_deadline`` and ``requeue_interval`` arguments of |RedisBroker| have been removed.
   These have been deprecated and have had no effect since version 1.2.0.
   (`#782`_, `@mikeroll`_)
+* |RedisBroker|: The code for compatibility with pre-v1.2.0 acks has been removed.
+  If you are using the |RedisBroker|, you must first upgrade Dramatiq to a version >=1.2.0, <2.0.0,
+  and run it for some time, before upgrading to a version >=2.0.0.
+  This is to allow Dramatiq to migrate the pre-v1.2.0 ack data structures in redis to the v1.2.0+
+  versions. This migration code is what has been removed in version 2.0.0.
+  (`#771`_, `@mikeroll`_)
 
 .. _#766: https://github.com/Bogdanp/dramatiq/pull/766
 .. _PEP-735: https://peps.python.org/pep-0735/
 .. _#741: https://github.com/Bogdanp/dramatiq/issues/741
+.. _#771: https://github.com/Bogdanp/dramatiq/pull/771
 .. _#772: https://github.com/Bogdanp/dramatiq/pull/772
 .. _#782: https://github.com/Bogdanp/dramatiq/pull/782
 .. _@mikeroll: https://github.com/mikeroll

dramatiq/brokers/redis/dispatch.lua

@@ -138,18 +138,6 @@ if do_maintenance == "1" then
             redis.call("hdel", xqueue_messages, unpack(dead_message_ids_batch))
         end
     end
-
-    -- The following code is required for backwards-compatibility with
-    -- the old way acks used to be implemented.  It hoists any
-    -- existing acks zsets into the per-worker sets.
-    local compat_queue_acks = queue_full_name .. ".acks"
-    local compat_message_ids = redis.call("zrangebyscore", compat_queue_acks, 0, timestamp - 86400000 * 7.5)
-    if next(compat_message_ids) then
-        for compat_message_ids_batch in iter_chunks(compat_message_ids) do
-            redis.call("sadd", queue_acks, unpack(compat_message_ids_batch))
-            redis.call("zrem", compat_queue_acks, unpack(compat_message_ids_batch))
-        end
-    end
 end
 
 

tests/test_redis.py

@@ -340,40 +340,6 @@ def test_redis_broker_raises_attribute_error_when_given_an_invalid_attribute(red
         redis_broker.idontexist
 
 
-def test_redis_broker_maintains_backwards_compat_with_old_acks(redis_broker):
-    # Given that I have an actor
-    @dramatiq.actor
-    def do_work(self):
-        pass
-
-    # And that actor has some old-style unacked messages
-    expired_message_ids = set()
-    valid_message_ids = set()
-    for i in range(LUA_MAX_UNPACK_SIZE * 2):
-        expired_message_id = b"expired-old-school-ack-%r" % i
-        valid_message_id = b"valid-old-school-ack-%r" % i
-        expired_message_ids.add(expired_message_id)
-        valid_message_ids.add(valid_message_id)
-        if redis.__version__.startswith("2."):
-            redis_broker.client.zadd("dramatiq:default.acks", 0, expired_message_id)
-            redis_broker.client.zadd("dramatiq:default.acks", current_millis(), valid_message_id)
-        else:
-            redis_broker.client.zadd("dramatiq:default.acks", {expired_message_id: 0})
-            redis_broker.client.zadd("dramatiq:default.acks", {valid_message_id: current_millis()})
-
-    # When maintenance runs for that actor's queue
-    redis_broker.maintenance_chance = MAINTENANCE_SCALE
-    redis_broker.do_qsize(do_work.queue_name)
-
-    # Then maintenance should move the expired message to the new style acks set
-    unacked = redis_broker.client.smembers("dramatiq:__acks__.%s.default" % redis_broker.broker_id)
-    assert set(unacked) == expired_message_ids
-
-    # And the valid message should stay in that set
-    compat_unacked = redis_broker.client.zrangebyscore("dramatiq:default.acks", 0, "+inf")
-    assert set(compat_unacked) == valid_message_ids
-
-
 def test_redis_consumer_ack_can_retry_on_connection_error(redis_broker, redis_worker):
     # Given that I have an actor
     @dramatiq.actor