Spark job部署模式
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    spark job的部署有两种模式，client和cluster
    spark-submit .. --deploy-mode client | cluster

    1.client
        默认值，driver运行在client端主机上。
        spark-submit --class com.oldboy.spark.mr.TaggenJava2 --master spark://s101:7077 --deploy-mode cluster hdfs://s101/user/centos/data/myspark.jar /user/centos/data/tags.txt

    2.cluster
        driver运行在某个worker节点上。客户端值负责提交job。
        $>spark-submit --class com.oldboy.spark.mr.TaggenJava2 --master spark://s101:7077 --deploy-mode cluster hdfs://s101/user/centos/data/myspark.jar /user/centos/data/tags.txt