HeartSaVioR commented on issue #27010: [SPARK-30313][CORE] Ensure EndpointRef is available MasterWebUI/WorkerPage URL: https://github.com/apache/spark/pull/27010#issuecomment-569150131 Btw, I found the bug can be reproduced consistently, via adding Thread.sleep(1000) just before endpointRefs.put(endpoint, endpointRef) in Dispatcher.registerRpcEndpoint(...). Also updated the same in the description of PR.
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