WARN [Consumer clientId=consumer-1, groupId=console-consumer-950] Connection to node -1 could not be
kafka報錯內容：
WARN [Consumer clientId=consumer-1, groupId=console-consumer-950] Connection to node -1 could not be established. Broker may not be available.
這是因為你的配置檔案中的PLAINTEXT跟你請求的內容不同。舉例來說，我在配置檔案裡配置的listeners=PLAINTEXT://10.127.96.151:9092，但是我想測試的時候請求的是./kafka-console-consumer.sh --bootstrap-server
localhost:9092 --topic topic1 --from-beginning
正確的應該是./kafka-console-consumer.sh --bootstrap-server 10.127.96.151:9092 --topic topic1 --from-beginning
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