dragonls commented on issue #5284:
URL: https://github.com/apache/pulsar/issues/5284#issuecomment-1077489078
We had exactly the same issue in 2.7.2.
It happens that when unloading the topic, the topic becomes fenced, and then
new producer and new consumer having error `Topic is temporarily unavailable`.
After restarting the broker, the issue resolved.
The broker log:
```
// unload
16:11:11.603 [pulsar-web-42-4] INFO
org.apache.pulsar.broker.admin.impl.PersistentTopicsBase - [admin] Unloading
topic persistent://sec/app/mid_291476475-partition-1
// disconnecting producers
16:11:11.603 [pulsar-web-42-4] INFO
org.apache.pulsar.broker.service.Producer - Disconnecting producer:
Producer{topic=PersistentTopic{topic=persistent://sec/app/mid_291476475-partition-1},
client=/9.165.193.134:55508, producerName=pulsar-bi-1406-4093, producerId=73}
16:11:11.603 [pulsar-web-42-4] INFO
org.apache.pulsar.broker.service.Producer - Disconnecting producer:
Producer{topic=PersistentTopic{topic=persistent://sec/app/mid_291476475-partition-1},
client=/9.165.243.144:44908, producerName=pulsar-bi-1406-4533, producerId=99}
...
// disconnecting consumer
16:11:11.607 [pulsar-web-42-4] INFO
org.apache.pulsar.broker.service.Consumer - Disconnecting consumer:
Consumer{subscription=PersistentSubscription{topic=persistent://sec/app/mid_291476475-partition-1,
name=mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669},
consumerId=1,
consumerName=mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669,
address=/9.165.226.119:33722}
16:11:11.607 [pulsar-web-42-4] INFO
org.apache.pulsar.broker.service.persistent.PersistentDispatcherMultipleConsumers
- Removed consumer
Consumer{subscription=PersistentSubscription{topic=persistent://sec/app/mid_291476475-partition-1,
name=mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669},
consumerId=1,
consumerName=mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669,
address=/9.165.226.119:33722} with pending 0 acks
...
16:11:11.712 [ForkJoinPool.commonPool-worker-15] WARN
org.apache.pulsar.broker.service.AbstractTopic -
[persistent://sec/app/mid_291476475-partition-1] Attempting to add producer to
a fenced topic
16:11:11.712 [pulsar-io-24-33] INFO
org.apache.pulsar.broker.service.ServerCnx -
[/9.165.217.148:59240][persistent://sec/app/mid_291476475-partition-1] Creating
producer. producerId=45
16:11:11.712 [pulsar-io-24-22] INFO
org.apache.pulsar.broker.service.ServerCnx -
[/9.165.193.122:40556][persistent://sec/app/mid_291476475-partition-1] Creating
producer. producerId=33
16:11:11.712 [ForkJoinPool.commonPool-worker-15] ERROR
org.apache.pulsar.broker.service.ServerCnx - [/9.165.193.228:45852] Failed to
add producer to topic persistent://sec/app/mid_291476475-partition-1: Topic is
temporarily unavailable
16:11:11.774 [pulsar-io-24-22] INFO
org.apache.pulsar.broker.service.ServerCnx - [/9.165.221.85:40652] Subscribing
on topic persistent://sec/app/mid_291476475-partition-1 /
mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669
16:11:11.774 [pulsar-io-24-22] WARN
org.apache.pulsar.broker.service.persistent.PersistentTopic -
[persistent://sec/app/mid_291476475-partition-1] Attempting to subscribe to a
fenced topic
16:11:11.774 [pulsar-io-24-22] WARN
org.apache.pulsar.broker.service.ServerCnx -
[/9.165.221.85:40652][persistent://sec/app/mid_291476475-partition-1][mmdcfisherimport-mid_291476475-dw_safe-ods_safe_topic_291476475-669]
Failed to create consumer: consumerId=1, Topic is temporarily unavailable
```
There are no logs shows like `Failed to unload topic` or `Successfully
unloaded topic`, which means that the unload operation is stuck somewhere.
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