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问题
Exception: java.net.ConnectException: Call From 5.hadoop.com/192.168.23.232 to 4.hadoop.com:10020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
java.net.ConnectException: Call From 5.hadoop.com/192.168.23.232 to 4.hadoop.com:10020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused




解决
$HADOOP_HOME/sbin/mr-jobhistory-daemon.sh start historyserver



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