massakam opened a new pull request #5191: [Issue #5176][pulsar-broker] Fix bug that fails to search namespace bundle due to NPE URL: https://github.com/apache/pulsar/pull/5191 Fixes #5176 ### Motivation As mentioned in #5176, NPE may occur in the load manager and fail to search for namespace bundles. This is because multiple threads may update a map named `brokerToNamespaceToBundleRange` at the same time. ### Modifications - Changed `brokerToNamespaceToBundleRange` to ConcurrentOpenHashMap instead of HashMap which is not thread safe. - Fixed `LoadManagerShared.removeMostServicingBrokersForNamespace()` logic so that NPE does not occur.
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