aloyszhang opened a new issue #9087:
URL: https://github.com/apache/pulsar/issues/9087
**Describe the bug**
Protocol handler kop exception,
```
java.util.concurrent.CompletionException:
java.util.ConcurrentModificationException
at
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
~[?:1.8.0_201]
at
java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
~[?:1.8.0_201]
at
java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:659)
~[?:1.8.0_201]
at
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632)
~[?:1.8.0_201]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
~[?:1.8.0_201]
at
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
~[?:1.8.0_201]
at
org.apache.pulsar.broker.service.BrokerService.lambda$getManagedLedgerConfig$40(BrokerService.java:1308)
~[pulsar-broker-2.8.0-rc-202012272229.jar:2.8.0-rc-202012272229]
at
org.apache.bookkeeper.mledger.util.SafeRun$2.safeRun(SafeRun.java:49)
[managed-ledger-2.8.0-rc-202012272229.jar:2.8.0-rc-202012272229]
at
org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36)
[bookkeeper-common-4.12.0.jar:4.12.0]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_201]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_201]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.51.Final.jar:4.1.51.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445)
~[?:1.8.0_201]
at java.util.HashMap$KeyIterator.next(HashMap.java:1469) ~[?:1.8.0_201]
at
org.apache.pulsar.broker.service.BrokerService.lambda$createPersistentTopic$32(BrokerService.java:1101)
~[pulsar-broker-2.8.0-rc-202012272229.jar:2.8.0-rc-202012272229]
at
java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656)
~[?:1.8.0_201]
... 10 more
```
**To Reproduce**
Steps to reproduce the behavior:
1. enable kop for pulsar broker
2. enable broker entey metadata for pulsar borker
3. start broker and may see this error
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