org.apache.kylin.engine.mr.exception.MapReduceException: Exception: java.net.ConnectException: Call From dxt102/192.168.1.102 to 0.0.0.0:10020 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
java.net.ConnectException: Call From dxt102/192.168.1.102 to 0.0.0.0:10020 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
    at org.apache.kylin.engine.mr.common.MapReduceExecutable.doWork(MapReduceExecutable.java:173)
    at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:164)
    at org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:70)
    at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:164)
    at org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:113)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

在使用kylin的时候需要开启历史服务器，10020是mr链接历史服务器的端口
执行命令 开启  $HADOOP_HOME/sbin/mr-jobhistory-daemon.sh start historyserver
jps检测是否有JobHistoryServer进程
 在actions中选择resume,让中断的任务重新执行