# Receiving \`maxmemory\` on ElastiCache Redis Cluster **URL:** \ **Category:** Site Operations Help\ **Created:** [July 20, 2023, 2:00pm UTC](https://discuss.openedx.org/t/receiving-maxmemory-on-elasticache-redis-cluster/10762 "2023-07-20T14:00:16Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Zachary\_Trabookis](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.openedx.org/zachary_trabookis/32/753_2.png) [@Zachary\_Trabookis](https://discuss.openedx.org/u/Zachary_Trabookis)\ **Post date:** [July 20, 2023, 2:00pm UTC](https://discuss.openedx.org/t/receiving-maxmemory-on-elasticache-redis-cluster/10762/1 "2023-07-20T14:00:16Z")
Currently running on `Maple` in production. After performing several course updates and re-runs we’re receiving the following error from ElastiCache Redis. Any advice on how to mitigate this max memory from occuring? This also happened when we updated several courses `CMS > Course > Settings > Advanced Settings` values all at once. CMS Import Indicates the following message. ![image](https://us1.discourse-cdn.com/flex020/uploads/openedx/original/2X/b/b4bd63692cd3444c849aab7aa0b3d98a8a630ba5.png) `cms-worker` error logs ```auto tutor_local-cms-worker-1 | [2023-07-20 13:44:57,757: CRITICAL/MainProcess] Unrecoverable error: ResponseError("Command # 1 (ZADD unacked_index 1689860697.7538862 65aa0263-7560-458c-8121-fb7a9fcdfafc) of pipeline caused error: OOM command not allowed when used memory > 'maxmemory'.") tutor_local-cms-worker-1 | Traceback (most recent call last): tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 3911, in _execute_transaction tutor_local-cms-worker-1 | response = self.parse_response(connection, '_') tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 3977, in parse_response tutor_local-cms-worker-1 | result = Redis.parse_response( tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 915, in parse_response tutor_local-cms-worker-1 | response = connection.read_response() tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/connection.py", line 756, in read_response tutor_local-cms-worker-1 | raise response tutor_local-cms-worker-1 | redis.exceptions.ExecAbortError: Transaction discarded because of previous errors. tutor_local-cms-worker-1 | tutor_local-cms-worker-1 | During handling of the above exception, another exception occurred: tutor_local-cms-worker-1 | tutor_local-cms-worker-1 | Traceback (most recent call last): tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/worker/worker.py", line 208, in start tutor_local-cms-worker-1 | self.blueprint.start(self) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/bootsteps.py", line 119, in start tutor_local-cms-worker-1 | step.start(parent) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/bootsteps.py", line 369, in start tutor_local-cms-worker-1 | return self.obj.start() tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/worker/consumer/consumer.py", line 318, in start tutor_local-cms-worker-1 | blueprint.start(self) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/bootsteps.py", line 119, in start tutor_local-cms-worker-1 | step.start(parent) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/worker/consumer/consumer.py", line 599, in start tutor_local-cms-worker-1 | c.loop(*c.loop_args()) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/celery/worker/loops.py", line 83, in asynloop tutor_local-cms-worker-1 | next(loop) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/asynchronous/hub.py", line 364, in create_loop tutor_local-cms-worker-1 | cb(*cbargs) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/redis.py", line 1083, in on_readable tutor_local-cms-worker-1 | self.cycle.on_readable(fileno) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/redis.py", line 354, in on_readable tutor_local-cms-worker-1 | chan.handlers[type]() tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/redis.py", line 744, in _brpop_read tutor_local-cms-worker-1 | self.connection._deliver(loads(bytes_to_str(item)), dest) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/virtual/base.py", line 983, in _deliver tutor_local-cms-worker-1 | callback(message) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/virtual/base.py", line 632, in _callback tutor_local-cms-worker-1 | self.qos.append(message, message.delivery_tag) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/kombu/transport/redis.py", line 155, in append tutor_local-cms-worker-1 | pipe.zadd(self.unacked_index_key, *zadd_args) \ tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 4019, in execute tutor_local-cms-worker-1 | return execute(conn, stack, raise_on_error) tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 3914, in _execute_transaction tutor_local-cms-worker-1 | raise errors[0][1] tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 3904, in _execute_transaction tutor_local-cms-worker-1 | self.parse_response(connection, '_') tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 3977, in parse_response tutor_local-cms-worker-1 | result = Redis.parse_response( tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/client.py", line 915, in parse_response tutor_local-cms-worker-1 | response = connection.read_response() tutor_local-cms-worker-1 | File "/openedx/venv/lib/python3.8/site-packages/redis/connection.py", line 756, in read_response tutor_local-cms-worker-1 | raise response tutor_local-cms-worker-1 | redis.exceptions.ResponseError: Command # 1 (ZADD unacked_index 1689860697.7538862 65aa0263-7560-458c-8121-fb7a9fcdfafc) of pipeline caused error: OOM command not allowed when used memory > 'maxmemory'. ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/openedx/original/2X/e/e0015f89e879bc75925b71fd11133ab15fe98297.png) [@system](https://discuss.openedx.org/u/system)\ **Post date:** [October 18, 2023, 2:01pm UTC](https://discuss.openedx.org/t/receiving-maxmemory-on-elasticache-redis-cluster/10762/2 "2023-10-18T14:01:04Z")
This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.