啟動報錯提示如圖：
localhost: failed to launch: nice -n 0 /home/chan/spark/spark-2.4.3-bin-hadoop2.7/bin/spark-class org.apache.spark.deploy.worker.Worker --webui-port 8081 spark://Hadoop:7077
localhost: JAVA_HOME is not set
localhost: full log in /home/chan/spark/spark-2.4.3-bin-hadoop2.7/logs/spark-chan-org.apache.spark.deploy.worker.Worker-1-hadoop.out
意思是說work啟動失敗，沒有找到java。
解決辦法：
在spark安裝目錄中sbin下的spark-config.sh中添加JAVA_HOME=jdk地址，具體操作如圖所示
啟動成功：
