why will be displayed as follows when i start hadoop: starting org.apache.spark.deploy.master.Master, logging to /opt/apps/spark-2.0.0-bin-hadoop2.6/logs/spark-root-org.apache.spark.deploy.master.Master-1-head2.out node4: starting org.apache.spark.deploy.worker.Worker, logging to /opt/apps/spark-2.0.0-bin-hadoop2.6/logs/spark-root-org.apache.spark.deploy.worker.Worker-1-node4.out node3: starting org.apache.spark.deploy.worker.Worker, logging to /opt/apps/spark-2.0.0-bin-hadoop2.6/logs/spark-root-org.apache.spark.deploy.worker.Worker-1-node3.out
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