主namenode 为standly状态,备namenode为active,kill备namenode,主namenode能正常切换为active。但是主namenode为active,备namenode为standby,kill主namenode,备namenode却无法切换成active状态,必须把主namenode启动才能切换成active
java.net.ConnectException: Call From vir02/192.168.37.14 to vir01:8020 failed on connection exception: java.net.ConnectException: Connection refused
vir02无法连接vir01,由于vir02没有做免密码登录vir01,vir01只能免密码登录vir02
注:Namenode之间都要做免密登录
原文:http://www.cnblogs.com/zwgblog/p/5727495.html