tonyvelichko opened a new issue #13713:
URL: https://github.com/apache/pulsar/issues/13713
**Describe the bug**
Opening the reader to the topic produces NPE, and causes the exception on
the client-side **Exclusive consumer is already connected**
```16:08:18.406 [pulsar-stats-updater-25-1] ERROR
org.apache.pulsar.broker.service.PulsarStats - Failed to generate namespace
stats for namespace integration-arrival/sspp: null
java.lang.NullPointerException: null
at
org.apache.bookkeeper.mledger.impl.ManagedCursorContainer.removeCursor(ManagedCursorContainer.java:128)
~[org.apache.pulsar-managed-ledger-2.7.4.jar:2.7.4]
at
org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.deactivateCursor(ManagedLedgerImpl.java:3122)
~[org.apache.pulsar-managed-ledger-2.7.4.jar:2.7.4]
at
org.apache.bookkeeper.mledger.impl.ManagedCursorImpl.setInactive(ManagedCursorImpl.java:956)
~[org.apache.pulsar-managed-ledger-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.persistent.PersistentTopic.lambda$checkBackloggedCursors$74(PersistentTopic.java:2063)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.persistent.PersistentTopic.checkBackloggedCursors(PersistentTopic.java:2058)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.PulsarStats.lambda$null$1(PulsarStats.java:141)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.PulsarStats.lambda$null$3(PulsarStats.java:131)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.PulsarStats.lambda$updateStats$4(PulsarStats.java:120)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:387)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:159)
~[org.apache.pulsar-pulsar-common-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.PulsarStats.updateStats(PulsarStats.java:110)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.pulsar.broker.service.BrokerService.updateRates(BrokerService.java:1370)
~[org.apache.pulsar-pulsar-broker-2.7.4.jar:2.7.4]
at
org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32)
[org.apache.pulsar-managed-ledger-2.7.4.jar:2.7.4]
at
org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36)
[org.apache.bookkeeper-bookkeeper-common-4.12.0.jar:4.12.0]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[?:1.8.0_312]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
[?:1.8.0_312]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
[?:1.8.0_312]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
[?:1.8.0_312]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_312]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_312]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[io.netty-netty-common-4.1.68.Final.jar:4.1.68.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
```
**Additional context**
The same workload ran on 2.7.1 had no errors.
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