rdhabalia opened a new pull request #4965: Fix: NPE while cleaning up namespace node URL: https://github.com/apache/pulsar/pull/4965 ### Motivation It fixes below NPE ``` 16:17:50.180 [main INFO org.apache.pulsar.broker.PulsarService - Starting name space service, bootstrap namespaces= 16:17:50.204 [main ERROR org.apache.pulsar.broker.namespace.NamespaceService - null java.lang.NullPointerException: null at org.apache.pulsar.broker.namespace.ServiceUnitZkUtils.cleanupSingleNamespaceNode(ServiceUnitZkUtils.java:156) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 at org.apache.pulsar.broker.namespace.ServiceUnitZkUtils.cleanupNamespaceNodes(ServiceUnitZkUtils.java:134) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 at org.apache.pulsar.broker.namespace.ServiceUnitZkUtils.cleanupNamespaceNodes(ServiceUnitZkUtils.java:137) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 at org.apache.pulsar.broker.namespace.ServiceUnitZkUtils.initZK(ServiceUnitZkUtils.java:113) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 at org.apache.pulsar.broker.namespace.NamespaceService.<init>(NamespaceService.java:151) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 at org.apache.pulsar.broker.PulsarService.lambda$getNamespaceServiceProvider$1(PulsarService.java:584) ~[org.apache.pulsar-pulsar-broker-2.4.0.jar:2.4.0 ```
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