Exception in thread "main" java.lang.IllegalArgumentException: java.net.UnknownHostException: master

$ spark-submit --class WordCountLocal --master yarn --deploy-mode cluster  --driver-memory 1g --executor-memory 1g --executor-cores 1  /home/appleyuchi/IdeaProjects/scala-learn/target/scala-learn-1.0-SNAPSHOT.jar
Exception in thread "main" java.lang.IllegalArgumentException: java.net.UnknownHostException: master
    at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:378)
    at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:310)
    at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:678)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2669)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:172)
    at org.apache.spark.deploy.yarn.Client$$anonfun$5.apply(Client.scala:121)
    at org.apache.spark.deploy.yarn.Client$$anonfun$5.apply(Client.scala:121)
    at scala.Option.getOrElse(Option.scala:121)
    at org.apache.spark.deploy.yarn.Client.<init>(Client.scala:121)
    at org.apache.spark.deploy.yarn.YarnClusterApplication.start(Client.scala:1520)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.net.UnknownHostException: master
    ... 22 more

解决方案:

#-------------------------------------
192.168.0.103    Desktop
192.168.0.102    Laptop
 改为:

#-------------------------------------
192.168.0.103    Desktop master
192.168.0.102    Laptop

最后

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