gaozhangmin opened a new pull request, #16259:
URL: https://github.com/apache/pulsar/pull/16259
### Motivation
When startup of standalone, the below error would be throw
```
2022-06-27T21:29:38,779+0800 [client-scheduler-OrderedScheduler-0-0] ERROR
org.apache.bookkeeper.clients.impl.internal.RootRangeClientImplWithRetries -
Reason for the failure {}
io.grpc.StatusRuntimeException: NOT_FOUND
at io.grpc.Status.asRuntimeException(Status.java:535)
~[io.grpc-grpc-api-1.42.1.jar:1.42.1]
at
io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:534)
~[io.grpc-grpc-stub-1.42.1.jar:1.42.1]
at
io.grpc.internal.DelayedClientCall$DelayedListener$3.run(DelayedClientCall.java:463)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at
io.grpc.internal.DelayedClientCall$DelayedListener.delayOrExecute(DelayedClientCall.java:427)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at
io.grpc.internal.DelayedClientCall$DelayedListener.onClose(DelayedClientCall.java:460)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:562)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:70)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:743)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:722)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
~[io.grpc-grpc-core-1.42.1.jar:1.42.1]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
~[?:1.8.0_312]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
~[?:1.8.0_312]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
```
Mistakenly thought the startup failed。
### Modifications
Remove `admin.getNamespace("default")` before creating namepsace.
Instead, throw `NamespaceExistsException ` if namespace exists.
### Documentation
Check the box below or label this PR directly.
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