poorbarcode commented on PR #20927:
URL: https://github.com/apache/pulsar/pull/20927#issuecomment-1664384321

   Additional context
   
   ```
   2023-08-02T02:21:46,026+0000 [BookKeeperClientWorker-OrderedExecutor-0-0] 
WARN  org.apache.pulsar.broker.service.ServerCnx - 
[/127.0.0.6:54641][persistent://sn/system/__xxx-partition-0][multiTopicsReader-3ec782c191]
 Failed to create consumer: consumerId=0, 
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for 
/managed-ledgers/sn/system/persistent/__xxx-partition-0-multiTopicsReader-3ec782c191__transaction_pending_ack
   java.util.concurrent.CompletionException: 
org.apache.pulsar.metadata.api.MetadataStoreException: 
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for 
/managed-ledgers/sn/system/persistent/__xxx-partition-0-multiTopicsReader-3ec782c191__transaction_pending_ack
        at 
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1177)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2309) 
~[?:?]
        at 
org.apache.pulsar.broker.service.persistent.PersistentSubscription.addConsumer(PersistentSubscription.java:215)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.broker.service.AbstractTopic.addConsumerToSubscription(AbstractTopic.java:536)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.lambda$internalSubscribe$16(PersistentTopic.java:785)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1187)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2309) 
~[?:?]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.lambda$internalSubscribe$18(PersistentTopic.java:780)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1187)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2309) 
~[?:?]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.internalSubscribe(PersistentTopic.java:701)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.broker.service.persistent.PersistentTopic.subscribe(PersistentTopic.java:677)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.broker.service.ServerCnx.lambda$handleSubscribe$11(ServerCnx.java:1135)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) 
~[?:?]
        at 
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147) 
~[?:?]
        at 
org.apache.pulsar.broker.service.schema.BookkeeperSchemaStorage$Functions.lambda$getLedgerEntry$0(BookkeeperSchemaStorage.java:655)
 ~[io.streamnative-pulsar-broker-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.bookkeeper.client.LedgerHandle$6.onSuccess(LedgerHandle.java:809) 
~[org.apache.bookkeeper-bookkeeper-server-4.15.4.jar:4.15.4]
        at 
org.apache.bookkeeper.client.LedgerHandle$6.onSuccess(LedgerHandle.java:806) 
~[org.apache.bookkeeper-bookkeeper-server-4.15.4.jar:4.15.4]
        at 
org.apache.bookkeeper.common.concurrent.FutureEventListener.accept(FutureEventListener.java:42)
 ~[org.apache.bookkeeper-bookkeeper-common-4.15.4.jar:4.15.4]
        at 
org.apache.bookkeeper.common.concurrent.FutureEventListener.accept(FutureEventListener.java:26)
 ~[org.apache.bookkeeper-bookkeeper-common-4.15.4.jar:4.15.4]
        at 
java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:841)
 ~[?:?]
        at 
java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482)
 ~[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) 
~[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) 
~[?:?]
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 ~[io.netty-netty-common-4.1.93.Final.jar:4.1.93.Final]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
   Caused by: org.apache.pulsar.metadata.api.MetadataStoreException: 
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for 
/managed-ledgers/sn/system/persistent/__xxx-partition-0-multiTopicsReader-3ec782c191__transaction_pending_ack
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:452)
 ~[io.streamnative-pulsar-metadata-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$existsFromStore$11(ZKMetadataStore.java:331)
 ~[io.streamnative-pulsar-metadata-2.11.2.2.jar:2.11.2.2]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
 ~[?:?]
        ... 4 more
   Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: 
KeeperErrorCode = ConnectionLoss for 
/managed-ledgers/sn/system/persistent/__xxx-partition-0-multiTopicsReader-3ec782c191__transaction_pending_ack
        at 
org.apache.zookeeper.KeeperException.create(KeeperException.java:102) 
~[org.apache.zookeeper-zookeeper-3.8.1.jar:3.8.1]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:54) 
~[org.apache.zookeeper-zookeeper-3.8.1.jar:3.8.1]
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:442)
 ~[io.streamnative-pulsar-metadata-2.11.2.2.jar:2.11.2.2]
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$existsFromStore$11(ZKMetadataStore.java:331)
 ~[io.streamnative-pulsar-metadata-2.11.2.2.jar:2.11.2.2]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
 ~[?:?]
        ... 4 more
   ```


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