datanode1: failed to launch: nice -n 0 /home/hadoop/spark-2.3.3-bin-hadoop2.7/bin/spark-class org.apache.spark.deploy.worker.Worker --webui-port 8081 spark://namenode1:7077 datanode1: Spark Command: /usr/java/jdk1.8.0_111/bin/java -cp /home/hadoop/spark-2.3.3-bin-hadoop2.7/conf/...